Revista Mexicana de Astronomía y Astrofísica
type: channel
description: The Revista Mexicana de Astronomía y Astrofísica, founded in 1974, publishes original research papers in all branches of astronomy, astrophysics and closely related fields. It is a digital journal, with open access. The editorial process is free of charge for all authors. Our journal has two main publications, the main journal RMxAA and the Conference Series, RMxAC.
publisher: Universidad Nacional Autónoma de México
language: en
publication name: Revista Mexicana de Astronomía y Astrofísica
issn: 3061-8649
items: Obituary: Francisco Sánchez Martínez (1936-2025)
items: Obituary: Julieta Fierro (1948 - 2025)
items: Obituary: George F. Smoot (1945-2025)
items: The first 10 years of the HAWC Gamma-Ray Observatory: science results
items: Characterization and First Analysis of Three Shallow-Contact Binary Systems
items: High-Energy Neutron Enhancements Not Classified as GLEs: A Case Study Using Ground-Based Neutron Monitor Data
items: Spectral and Dynamical Study of 12p/Pons-Brooks
items: Theory of Functional Connections Applied to the Temporary Gravitational Capture Problem
items: Collisions in a System of Conical Jet/Counterjet Outflows
items: Blade Antenna-SDR System Prototype for the CANTAR Global 21-cm Experiment: Simulations, Measurements, and In-Situ Results
items: Analysis of Spatio-Temporal Changes in Future Artificial Light Pollution and Projections Until 2029 and 2041: A Case Study in the Brazilian States of Roraima, Amazonas, Acre, and Rondônia
items: Astronomical Site Selection Scenarios for Asia
items: Gaseous Disks in White Dwarfs: Properties of the Current Sample
items: Analysis of Telescope-Detector Coupling for a Mid-Infrared Solar Flare Observations Telescope
items: A New Set of Classical-Like Mass Assignment Schemes for Power Spectrum Estimation
items: The 2025 Release of Cloudy
items: Physical Properties of Hii Regions at Sub-kpc Scales Using Integral Field Spectroscopy on IC 342
items: Lithium in V505 Per
items: Spectroscopic Study of Blue Straggler Stars in the Globular Cluster NGC 3201
items: Espartaco 2, a New Stellar Spectrograph at Universidad de los Andes
items: Confirmation and Characterization of Galactic Planetary Nebulae: Insights from a Spectroscopic Study
items: Investigating Open Cluster KING 6: Detection of Three New Variables
items: Deep-TAO: The Deep Learning Transient Astronomical Object data set for Astronomical Transient Event Classification
items: Asymmetry and Concentration Parameters for Dwarf Late-Type Spiral Galaxies
items: An Oscillating Rastall Universe Crossing the Phantom Divide Line
items: Proper motions of L1551 IRS 5 binary system using 7 mm VLA observations
items: Infrared characteristics of the BIS catalog objects
items: On the Longevity of current epoch Compact Group-like Associations in a ΛCDM Cosmology
items: CANICA: The Cananea Near-Infrared Camera at the 2.1 m OAGH Telescope
items: Proper motions of the HH 1 jet

Obituary: Francisco Sánchez Martínez (1936-2025)
type: item
description: Obituary: Francisco Sánchez Martínez (1936-2025) by José Franco.
subject: Obituary
  topic: section
creator: José Franco
rights: Copyright (c) 2025 Universidad Nacional Autónoma de México https://creativecommons.org/licenses/by-nc/4.0/
date: 2025-11-26
publication date: 2025-11-26
starting page: 304
ending page: 305

Obituary: Julieta Fierro (1948 - 2025)
type: item
description: Obituary: Julieta Fierro (1948 - 2025) by Silvia Torres-Peimbert.
subject: Obituary
  topic: section
creator: Silvia Torres-Peimbert
rights: Copyright (c) 2025 Universidad Nacional Autónoma de México https://creativecommons.org/licenses/by-nc/4.0/
date: 2025-11-26
publication date: 2025-11-26
starting page: 302
ending page: 303

Obituary: George F. Smoot (1945-2025)
type: item
description: Obituary: George F. Smoot (1945-2025) by Omar López-Cruz.
subject: Obituary
  topic: section
creator: Omar López-Cruz
rights: Copyright (c) 2025 Universidad Nacional Autónoma de México https://creativecommons.org/licenses/by-nc/4.0/
date: 2025-11-26
publication date: 2025-11-26
starting page: 300
ending page: 301

The first 10 years of the HAWC Gamma-Ray Observatory: science results
type: item
description: The High-Altitude Water Cherenkov (HAWC) Observatory, located on the slopes of the Sierra Negra volcano in Mexico, began operations in March 2015. Over the past decade, HAWC has enabled the exploration of a broad range of topics in high-energy astrophysics and particle physics, resulting in more than 90 peer-reviewed publications. These studies have significantly advanced our understanding of several previously unexplored and poorly understood phenomena in the TeV energy regime. The present work provides an overview of the key scientific contributions of HAWC during its first ten years of operation.
subject: Research articles
  topic: section
creator: A. Albert
creator: R. Alfaro
creator: C. Alvarez
creator: A. Andrés
creator: E. Anita-Rangel
creator: M. Araya
creator: J. C. Arteaga-Velázquez
creator: K. P. Arunbabu
creator: D. Avila Rojas
creator: H. A. Ayala Solares
creator: R. Babu
creator: P. Bangale
creator: E. Belmont-Moreno
creator: S. BenZvi
creator: A. Bernal
creator: C. Brisbois
creator: S. Caballero-Mora
creator: J. I. Cabrera Martínez
creator: T. Capistrán
creator: A. Carramiñana
creator: F. Carreón
creator: S. Casanova
creator: P. Chambery
creator: P. Colín-Farias
creator: A. L. Colmenero-Cesar
creator: U. Cotti
creator: J. Cotzomi
creator: S. Coutiño de León
creator: E. De la Fuente
creator: C. de León
creator: R. DeLay
creator: D. Depaoli
creator: P. Desiati
creator: N. Di Lalla
creator: R. Diaz Hernandez
creator: B. L. Dingus
creator: M. A. DuVernois
creator: J. C. Díaz-Vélez
creator: R. W. Ellsworth
creator: K. Engel
creator: T. Ergin
creator: C. Espinoza
creator: K. L. Fan
creator: K. Fang
creator: H. Fleischhack
creator: N. Fraija
creator: S. Fraija
creator: J. A. García-González
creator: F. Garfias
creator: N. Ghosh
creator: H. Goksu
creator: A. Gonzalez Muñoz
creator: M. M. González
creator: J. A. González
creator: J. A. Goodman
creator: S. Groetsch
creator: J. Gyeong
creator: J. P. Harding
creator: S. Hernandez Cadena
creator: I. Herzog
creator: D. Huang
creator: F. Hueyotl-Zahuantitla
creator: P. Hüntemeyer
creator: A. Iriarte
creator: S. Kaufmann
creator: N. Kelley-Hoskins
creator: D. Kieda
creator: A. Lara
creator: R. Lauer
creator: K. Leavitt
creator: W. H. Lee
creator: J. Lee
creator: H. León Vargas
creator: T. Lewis
creator: J. T. Linnemann
creator: A. L. Longinotti
creator: G. Luis-Raya

Characterization and First Analysis of Three Shallow-Contact Binary Systems
type: item
description: We present a photometric study and characterization of three contact eclipsing binary systems, analyzed using the Wilson-Devinney code in its Python implementation (PyWD2015). Analysis of the CCD-filtered and TESS light curves reveals that two of these systems are totally eclipsing, display starspots and belong to the W-subtype. These systems exhibit good thermal contact with a low degree of overcontact, and their components are consistent with late-type stars. The remaining system is an A-subtype W UMa binary, characterized by a considerable temperature difference between the components (∆T ~2200K) despite a low mass ratio (q = M2/M1). The times of minima derived from our observations, as well as from optical sky surveys, cover sufficient orbital cycles, allowing us to refine their ephemerides and present O-C diagrams fitted with polynomial functions. Additionally, the orbital angular momentum ( J0 ) of each system was calculated, and their positions were plotted on the logM-logL and Temperature-Period diagrams for further comparison.
subject: Research articles
  topic: section
subject: (stars:) binaries: eclipsing
  topic: keywords
subject: (stars): fundamental parameters
  topic: keywords
subject: (stars): individual: TIC 9625207
  topic: keywords
subject: TIC 23081489
  topic: keywords
subject: TIC 426271738
  topic: keywords
subject: (techniques): photometric
  topic: keywords
creator: C. Barani
creator: R. Michel
creator: F. Acerbi
creator: P. Santillán-Ortega
rights: Copyright (c) 2025 Universidad Nacional Autónoma de México https://creativecommons.org/licenses/by-nc/4.0/
date: 2025-11-26
publication date: 2025-11-26
starting page: 240
ending page: 260
doi: 10.22201/ia.01851101p.2025.61.03.12

High-Energy Neutron Enhancements Not Classified as GLEs: A Case Study Using Ground-Based Neutron Monitor Data
type: item
description: During their propagation through the interplanetary medium, cosmic rays interact with solar and interplanetary structures, which can cause fluctuations in their intensity observed at ground level. In this work, we apply a statistical method of overlapping epochs to analyze the effect of solar flares and energetic particle events on the intensity of cosmic radiation, considering periods of low geomagnetic activity and a 24-hour interval before and after the onset of the events. Our objective is to identify possible variations of tiny amplitude, observable simultaneously at different monitoring stations. The results indicate that solar flares, whether accompanied by energetic particle events or not, are not associated with noticeable increases in the cosmic ray intensity. This suggests that small increases may go undetected without specific treatment to highlight subtle variations.
subject: Research articles
  topic: section
subject: cosmic rays
  topic: keywords
subject: particle emission
  topic: keywords
subject: flares
  topic: keywords
subject: solar-terrestrial relations
  topic: keywords
creator: E. Tirado-Bueno
creator: J. E. Mendoza-Torres
creator: C. Amador-Meléndez
rights: Copyright (c) 2025 Universidad Nacional Autónoma de México https://creativecommons.org/licenses/by-nc/4.0/
date: 2025-11-26
publication date: 2025-11-26
starting page: 233
ending page: 239
doi: 10.22201/ia.01851101p.2025.61.03.11

Spectral and Dynamical Study of 12p/Pons-Brooks
type: item
description: We present a spectral and dynamical study of the Halley-type comet 12P/Pons-Brooks (~ 71 year period), confirming its intense cometary activity. We performed an N-body simulation, integrating its orbit for 2×105 years, to analyze its chaoticity and close encounters with Venus, Earth, Mars, Jupiter, and Saturn. The orbit becomes highly chaotic for t < 20×103 years, with significant instabilities arising between 15-20×103 years. We calculate a Lyapunov time of ~ 200 yr.
subject: Research articles
  topic: section
subject: Celestial mechanics
  topic: keywords
subject: Comets: individual (12P/Pons-Brooks)
  topic: keywords
subject: Method: numerical
  topic: keywords
subject: Techniques: spectroscopic
  topic: keywords
creator: Matheus Agenor
creator: Daniela C. Mourão
creator: Luke Dones
creator: Rodolfo Langhi
creator: Markus Kohl
rights: Copyright (c) 2025 Universidad Nacional Autónoma de México https://creativecommons.org/licenses/by-nc/4.0/
date: 2025-11-26
publication date: 2025-11-26
starting page: 224
ending page: 232
doi: 10.22201/ia.01851101p.2025.61.03.10

Theory of Functional Connections Applied to the Temporary Gravitational Capture Problem
type: item
description: This paper presents applications of the Theory of Functional Connections (TFC) for solving problems in celestial mechanics, with a focus on temporary gravitational capture. The univariate TFC framework is employed to solve second-order differential equations. The mathematical formulation for the solution of the two-body problem and the circular restricted three-body problem (CR3BP) through TFC is presented and some differences between the circular and elliptic problems are discussed. The application of TFC to solve the temporary gravitational capture based on the CR3BP, considering backward integration, is presented under different formulations, including inertial and rotating frames, as well as initial and boundary value problems. Error comparisons among these cases are provided and the best strategies for solving the capture problem, depending on the need, are discussed.
subject: Research articles
  topic: section
subject: TFC
  topic: keywords
subject: Theory of Functional Connections
  topic: keywords
subject: Temporary Gravitational Capture
  topic: keywords
creator: G. Afonso Siqueli
creator: A. K. de Almeida Junior
creator: A. F. B. A. Prado
rights: Copyright (c) 2025 Universidad Nacional Autónoma de México https://creativecommons.org/licenses/by-nc/4.0/
date: 2025-11-26
publication date: 2025-11-26
starting page: 211
ending page: 223
doi: 10.22201/ia.01851101p.2025.61.03.09

Collisions in a System of Conical Jet/Counterjet Outflows
type: item
description: Stars predominantly form in compact, non-hierarchical clusters. The gas outflows ejected by protostars can intersect and interact with each other, resulting in complex interactions that affect the dynamics, morphology, and evolution of these outflows. Determining the probability of an encounter between them requires a Bayesian approach that considers the collimation, length (or age), and separation between young stellar objects in clusters. In this study, we employed a Monte Carlo approach to estimate this probability as a function of the jet opening angle and the ratio between the jet length and separation between stars. We propose a function that predicts the number of interactions within a cluster based on the opening angle of the gas outflows ejected by protostars.
subject: Research articles
  topic: section
subject: ISM: jets and outflows
  topic: keywords
subject: ISM: kinematics and dynamics
  topic: keywords
subject: stars: pre-main sequence
  topic: keywords
subject: stars: winds, outflows
  topic: keywords
creator: A. C. Raga
creator: Z. Meliani
creator: A. Rodríguez-González
creator: S. Cabrit
creator: G. Pineau des Forêts
creator: J. I. Castorena
creator: A. Esquivel
rights: Copyright (c) 2025 Universidad Nacional Autónoma de México https://creativecommons.org/licenses/by-nc/4.0/
date: 2025-11-26
publication date: 2025-11-26
starting page: 204
ending page: 210
doi: 10.22201/ia.01851101p.2025.61.03.08

Blade Antenna-SDR System Prototype for the CANTAR Global 21-cm Experiment: Simulations, Measurements, and In-Situ Results
type: item
description: We present the design and initial testing of a low-frequency radio telescope prototype developed for the Colombian Antarctic Telescope for 21-cm Absorption during Reionization (CANTAR) experiment. Operating from 100 to 200 MHz, the system integrates a blade dipole antenna inspired by the EDGES high-band design with a software-defined radio (SDR) receiver. We report simulations of antenna impedance and beam chromaticity, along with SDR performance tests (Limenet Mini, Ettus E310, and USRP2920). A dual-stage low-noise amplifier reduces the system temperature, enabling foreground-sensitive observations. Radiometric estimates suggest that sub-mK sensitivity is achievable with 1000 h of integration. This prototype is part of Colombia's emerging infrastructure for 21-cm cosmology, with deployments planned at low-RFI sites in the Colombian Andes and Antarctica.
subject: Research articles
  topic: section
subject: cosmology: observations
  topic: keywords
subject: dark ages
  topic: keywords
subject: reionization
  topic: keywords
subject: first stars
  topic: keywords
subject: instrumentation: detectors
  topic: keywords
subject: instrumentation: miscellaneous
  topic: keywords
subject: radio continuum: general
  topic: keywords
subject: site testing
  topic: keywords
creator: Felipe P. Mosquera
creator: Julian Rodriguez-Ferreira
creator: Efrén Acevedo
creator: Oscar Restrepo
creator: David González
creator: Germán Chaparro
rights: Copyright (c) 2025 Universidad Nacional Autónoma de México https://creativecommons.org/licenses/by-nc/4.0/
date: 2025-11-26
publication date: 2025-11-26
starting page: 189
ending page: 203
doi: 10.22201/ia.01851101p.2025.61.03.07

Analysis of Spatio-Temporal Changes in Future Artificial Light Pollution and Projections Until 2029 and 2041: A Case Study in the Brazilian States of Roraima, Amazonas, Acre, and Rondônia
type: item
description: This study presents an integrated spatial and temporal analysis of night sky brightness transitions, classified into Bortle classes using the MOLUSCE plugin. Future projections for 2029 and 2041 were generated based on remote sensing data from 2017 and 2020. The results indicate that the “Excellent Sky” and “Typical Dark Sky” classes may decrease by 100% and 56%, respectively, while the “Rural Sky” class could lose approximately 284,679 km2. In contrast, the “Rural-suburban Transition” class is projected to grow by 73%, with smaller increases in the “Suburban”, “Bright Suburban”, “Suburban/urban Transition”, and “Urban Center” classes. The “Urban Center” class shows a steady growth rate of 0.004%. These trends suggest a continued spread of light pollution into rural areas. The results provide valuable input for national and local authorities to anticipate future light-pollution patterns and develop effective mitigation strategies.
subject: Research articles
  topic: section
subject: AL change
  topic: keywords
subject: remote sensing-GIS
  topic: keywords
subject: Molusce
  topic: keywords
subject: Bortle classes
  topic: keywords
creator: Abdulvahap Yılmaz
rights: Copyright (c) 2025 Universidad Nacional Autónoma de México https://creativecommons.org/licenses/by-nc/4.0/
date: 2025-11-26
publication date: 2025-11-26
starting page: 179
ending page: 188
doi: 10.22201/ia.01851101p.2025.61.03.06

Astronomical Site Selection Scenarios for Asia
type: item
description: This study aimed to identify and evaluate suitable areas for astronomical observations in Asia using Geographic Information System (GIS) and Multi-Criteria Decision Analysis (MCDA) methods. Our study provides spatial coverage with satellite-based datasets to determine the ideal astronomical areas in Asia for future telescope construction. These datasets were created by adding a digital elevation model (DEM) and artificial light (AL), along with atmospheric data such as cloud cover (CC), precipitation water vapor content (PWV), aerosol optical density (AOD), and wind speed (WS). The dataset was analyzed using a combination of MCDA and GIS techniques. On the continent, the Tibetan Plateau and its surroundings (except the area around 90° E - 35° N) in northern China were identified as the most suitable areas for astronomical studies with radio telescopes. Suitable areas for infrared and optical telescopes are mainly found in the southeast of the Tibetan Plateau (around 83° E - 31° N). According to the analysis, an area of 369,096 km2, which corresponds to approximately 0.83% of the continent, is best suited for infrared observations. Approximately 3.87% of the continent, that is, about 1,725,246 km2, is best suited for radio telescopes, while 0.8%, that is, 355,842 km2, is best suited for observations with optical telescopes. The Corona-Borealis Observatory (Ngari) is located in the most ideal location for all three scenarios. The findings of this study are of great importance for future plans for astronomical sites on the continent.
subject: Research articles
  topic: section
subject: Observatory
  topic: keywords
subject: Site selection
  topic: keywords
subject: Infrared-Radio-Optical
  topic: keywords
subject: MCDA
  topic: keywords
creator: Abdulvahap Yılmaz
rights: Copyright (c) 2025 Universidad Nacional Autónoma de México https://creativecommons.org/licenses/by-nc/4.0/
date: 2025-11-26
publication date: 2025-11-26
starting page: 165
ending page: 178
doi: 10.22201/ia.01851101p.2025.61.03.05

Gaseous Disks in White Dwarfs: Properties of the Current Sample
type: item
description: In recent years, the number of white dwarfs (WDs) known to feature infrared (IR) excesses attributed to circumstellar dust disks has grown significantly. Gaseous disks have also been detected in some WDs with dust. We obtained optical spectra with Gemini/GMOS for 13 WDs exhibiting IR excesses to search for gaseous components. No Ca II emission was detected, suggesting that the gas phase may be short-lived compared to the dusty stage. By combining our data with those from the literature, we compiled the largest sample (to date) of WDs with and without gaseous disks. We found no significant differences in stellar properties between the two groups, although disks with gas may be, on average, brighter. The detection rate of Ca II emission supports the idea that the gas phase persists for only a fraction of the total disk lifetime. A more definitive assessment will likely require dedicated searches for both gas and dust across large WD samples.
subject: Research articles
  topic: section
subject: Stars: white dwarfs
  topic: keywords
subject: Stars: circumstellar matter
  topic: keywords
subject: Line: profiles
  topic: keywords
subject: Accretion
  topic: keywords
subject: accretion disks
  topic: keywords
creator: L. Saker
creator: M. Gómez
creator: L. García
rights: Copyright (c) 2025 Universidad Nacional Autónoma de México https://creativecommons.org/licenses/by-nc/4.0/
date: 2025-11-26
publication date: 2025-11-26
starting page: 154
ending page: 164
doi: 10.22201/ia.01851101p.2025.61.03.04

Analysis of Telescope-Detector Coupling for a Mid-Infrared Solar Flare Observations Telescope
type: item
description: This study analyzes various optical couplings between an RC telescope and an MIR detector to develop a portable instrument for solar observation. The coupling systems included lenses or mirrors –custom-made and catalog types–, as well as direct coupling analysis. Simulations of the couplings were performed using the Zemax package to estimate the ray dispersion, Airy disk diameter, and PSF. Coupling with catalog lenses shows better performance, and their FOV allows the observation of a region as wide as the solar diameter. Direct coupling provides a higher spatial resolution for resolving smaller solar active regions, although it has a smaller FOV than indirect coupling. Therefore, depending on the observation goal on the Sun, the telescope can operate with either optical coupling configuration to cover a larger or smaller area on the solar disk.
subject: Research articles
  topic: section
subject: Infrared: general
  topic: keywords
subject: Instrumentation: detectors
  topic: keywords
subject: Sun: infrared, Telescopes
  topic: keywords
creator: J. S. Palacios-Fonseca
creator: J. E. Mendoza-Torres
creator: M. Velázquez
rights: Copyright (c) 2025 Universidad Nacional Autónoma de México https://creativecommons.org/licenses/by-nc/4.0/
date: 2025-11-26
publication date: 2025-11-26
starting page: 142
ending page: 153
doi: 10.22201/ia.01851101p.2025.61.03.03

A New Set of Classical-Like Mass Assignment Schemes for Power Spectrum Estimation
type: item
description: In this study, we present the impact of the mass-assignment scheme (MAS) on the estimation of the power spectrum and bispectrum in simulations of structure formation. We used numerical simulations to study the aliasing effect for both power spectrum and bispectrum estimation using the classical MAS, such as Nearest Grid Point, Cloud In Cell, and Triangular Shaped Cloud, to estimate, which of them suffers from a smaller aliasing effect for both small and large scales. We propose a new set of MAS, the NJ1, NJ2, and NJ3 functions, and study its aliasing effect, obtaining an improvement with respect to the classical schemes without the need for additional computational resources. We show that with the newly proposed MAS, we achieve comparable or even better performance in the aliasing of the power spectrum and bispectrum at the expense of a lower computational cost compared to high-order interpolation schemes such as PCS, resulting in an effective improvement in the estimation of the power spectrum and bispectrum.
subject: Research articles
  topic: section
subject: cosmology: large-scale
  topic: keywords
subject: cosmology: miscellaneous
  topic: keywords
subject: methods: numerical
  topic: keywords
subject: structure of Universe
  topic: keywords
creator: O. N. Gomez-Giraldo
creator: J. C. Muñoz-Cuartas
rights: Copyright (c) 2025 Universidad Nacional Autónoma de México https://creativecommons.org/licenses/by-nc/4.0/
date: 2025-11-26
publication date: 2025-11-26
starting page: 134
ending page: 141
doi: 10.22201/ia.01851101p.2025.61.03.02

The 2025 Release of Cloudy
type: item
description: We present the 2025 release of the spectral synthesis code CLOUDY, highlighting the significant enhancements in the scope and accuracy of the physics that have been made since the previous release. This key development resolves the Lyman-alpha line into j-resolved fine-structure doublets, thereby making CLOUDY useful to the X-ray community. We also updated the inner-shell ionization line energies and incorporated the 1 keV feature that is commonly observed in X-ray binaries. In addition, we updated the Stout database for the carbon isoelectronic sequence, improving the CLOUDY microphysical calculations for all wavelengths. The molecular network has also been extended with new silicon-bearing species, titanium-related reactions, and phosphorus-containing molecules, enhancing CLOUDY’s ability to model the complex chemistry relevant to exoplanet atmospheres. Finally, we outline future developments aimed at maximizing scientific returns from current and upcoming generations of observatories.
subject: Research articles
  topic: section
subject: Atomic data
  topic: keywords
subject: Astronomy software
  topic: keywords
subject: Active galaxies
  topic: keywords
subject: Computational methods
  topic: keywords
subject: Galaxy clusters
  topic: keywords
subject: Molecular data
  topic: keywords
creator: Chamani M. Gunasekera
creator: Peter A. M. van Hoof
creator: Maryam Dehghanian
creator: Priyanka Chakraborty
creator: Gargi Shaw
creator: Stefano Bianchi
creator: Marios Chatzikos
creator: Masahiro Tsujimoto
creator: Gary J. Ferland
rights: Copyright (c) 2025 Universidad Nacional Autónoma de México https://creativecommons.org/licenses/by-nc/4.0/
date: 2025-11-26
publication date: 2025-11-26
starting page: 120
ending page: 133
doi: 10.22201/ia.01851101p.2025.61.03.01

Physical Properties of Hii Regions at Sub-kpc Scales Using Integral Field Spectroscopy on IC 342
type: item
description: In this study, we use Integral Field Spectroscopic (IFS) observations for one of the closest galaxies to us, the grand design spiral IC342, to derive the physical properties of Hii regions at sub-kpc scales. To our knowledge, the IFS data represent the most comprehensive observational effort in the optical range for this galaxy. The final IFS datacube consists of 349 individual pointings using IFS instrumentation from the SDSS-IV MaNGA survey. Using a prototype of the data analysis pipeline that will be devoted to the SDSS-V Local Volume Mapper (LVM) survey, we measured different observables from the optical emission line. In particular, using the flux map of the H$\alpha$ emission line, we derived the location and size of Hii region candidates for IC342. Using the integrated flux for different emission lines within each region, we derived the radial distribution of different physical properties from the ionized gas (e.g., optical extinction, H$\alpha$ luminosity, oxygen abundance, etc.). Compared with larger samples of galaxies with IFS data, our results suggest that the physical properties of the ionized gas of IC342 are similar to those of galaxies with similar stellar masses in the nearby universe.
subject: Research articles
  topic: section
creator: J. Barrera-Ballesteros
creator: J. Méndez Delgado
creator: D. Bizyaev
creator: N. Drory
creator: L. Carigi
creator: H. Ibarra-Medel
creator: A. Lugo-Aranda
creator: K. Kreckel
creator: S. Sánchez
creator: Guillermo Blanc
rights: Copyright (c) 2025 https://creativecommons.org/licenses/by-nc/4.0/
date: 2025-09-16
publication date: 2025-09-16
starting page: 98
ending page: 119
doi: 10.22201/ia.01851101p.2025.61.02.09

Lithium in V505 Per
type: item
description: We determined the surface lithium abundance of the eclipsing binary components in V 505 Per (HIP 10961) to be $A(Li)$ = 2.65$\pm$0.07 and 2.35$\pm$0.1, which supports the rather unexpected conclusion that their surface Li abundances differ. We find effective temperatures of 6600 K + 6550 K ($\sim$150 K higher than previously reported), which places the stars at the hot limit of the Lithium Dip, thus alleviating the previously suggested discrepancy with cluster stars of similar ages and temperatures. These temperatures are also more consistent with the system's Gaia spectral energy distribution. Our iron abundances, $[Fe/H] = -0.15\pm 0.07$ and $-0.25\pm 0.1$, agree with the predictions of the higher temperatures deduced from our spectra and from the evolutionary tracks. The rotation rate implied by our line profiles, 12.5$\pm$1 km\s$^{-1}$, is smaller than the synchronous rotation rate, which is a curious result given the circular orbit and the age of the system.
subject: Research articles
  topic: section
subject: Stars: binaries:eclipsing
  topic: keywords
subject: Stars: binaries: spectroscopic
  topic: keywords
subject: Stars: chemical abundances
  topic: keywords
creator: Gloria Koenigsberger
creator: Werner Schmutz
creator: Catherine Pilachowski
creator: Alan Mejía-Nava
creator: Derek Sikorski
creator: María Cordero
rights: Copyright (c) 2025 https://creativecommons.org/licenses/by-nc/4.0/
date: 2025-09-16
publication date: 2025-09-16
starting page: 84
ending page: 97
doi: 10.22201/ia.01851101p.2025.61.02.08

Spectroscopic Study of Blue Straggler Stars in the Globular Cluster NGC 3201
type: item
description: We conducted a spectroscopic study of 39 blue straggler stars in the globular cluster NGC 3201. The spectra of these stars have been previously reported. We determined the radial velocity, atmospheric parameters (T$_{eff}$, log $g$), Mg abundance, and metallicity ([Fe/H]) for all sources in the sample. The mean radial velocity and [Fe/H] were determined to be 498.0$\pm$5.3 km/s and -1.42$\pm$0.27, respectively. The derived [Fe/H] is consistent, within uncertainties, with the cluster's [Fe/H] of -1.59 dex. The mean [Mg/Fe] for the sample was estimated to be 0.36$\pm$0.73. Importantly, this study is the first to estimate [Mg/Fe] for blue straggler stars in the cluster NGC 3201.
subject: Research articles
  topic: section
subject: Blue Straggler Stars
  topic: keywords
subject: Globular star clusters: NGC~3201
  topic: keywords
subject: Spectroscopy
  topic: keywords
creator: Gourav Kumawat
creator: Arvind Dattatrey
creator: R. Yadav
rights: Copyright (c) 2025 https://creativecommons.org/licenses/by-nc/4.0/
date: 2025-09-16
publication date: 2025-09-16
starting page: 76
ending page: 83
doi: 10.22201/ia.01851101p.2025.61.02.07

Espartaco 2, a New Stellar Spectrograph at Universidad de los Andes
type: item
description: We present the construction and early results of ESPARTACO 2, a new stellar spectrograph built for research and education at the Astronomical Observatory of the Universidad de los Andes in Bogotá, Colombia. This instrument offers several resolution modes, from 20,000 in the first order using a 50 $\mu$m fiber, to 100,000 in the second order in the near-infrared. Precise radial-velocity measurements were made possible by simultaneous wavelength calibration. Combined with the 40-cm Meade telescope located at our facilities, a limiting magnitude of 6 was achieved. This instrument represents a significant improvement over its predecessor in terms of throughput, reliability, and ease of use.
subject: Research articles
  topic: section
subject: astronomical instrumentation
  topic: keywords
subject: stars: radial velocity
  topic: keywords
subject: astronomy education
  topic: keywords
creator: B. Oostra
creator: M. Batista
rights: Copyright (c) 2025
date: 2025-09-16
publication date: 2025-09-16
starting page: 71
ending page: 75
doi: 10.22201/ia.01851101p.2025.61.02.06

Confirmation and Characterization of Galactic Planetary Nebulae: Insights from a Spectroscopic Study
type: item
description: We present a spectroscopic investigation of 25 objects previously reported as possible Planetary Nebulae (PNe) in recent catalogs to obtain their physical properties and establish their true nature. We found 11 objects showing intense emission lines, 11 objects where it was not possible to measure $\mathrm{H{\beta}}$, and 3 objects where no lines were present. We used diagnostic diagrams to confirm the true PN nature of the eight objects. We obtained elemental abundances for the three objects, the values of which are in agreement with the mean PNe values for our Galaxy. Four objects show [NII] $\lambda$6583 being more intense than $\mathrm{H{\alpha}}$, and for two of them, this can be explained by the presence of shocks in the gas. Finally, we report angular sizes based on $\mathrm{H{\alpha}}$ and [OIII] $\lambda$5007 emission.
subject: Research articles
  topic: section
subject: catalogues
  topic: keywords
subject: ISM: abundance
  topic: keywords
subject: planetary nebulae: general
  topic: keywords
subject: techniques: spectroscopic
  topic: keywords
creator: D. Beleño-Molina
creator: L. Olguín
creator: L. Miranda
creator: M. Contreras
creator: R. Vázquez
rights: Copyright (c) 2025 https://creativecommons.org/licenses/by-nc/4.0/
date: 2025-09-16
publication date: 2025-09-16
starting page: 52
ending page: 70
doi: 10.22201/ia.01851101p.2025.61.02.05

Investigating Open Cluster KING 6: Detection of Three New Variables
type: item
description: This study presents a photometric analysis of the intermediate-age open cluster King 6, utilizing photometric data in UBV(RI)c passbands and JHKs from the 2MASS mission. Gaia DR3 kinematic data were used to estimate the membership probabilities, and TESS data were employed to search for variable stars within the cluster. The cluster's radius is estimated to be 9’.0 based on the stellar density profile, while optical and near-infrared color-color diagrams revealed color excesses of E(B-V) = 0.58 +/- 0.03, E(J-K) = 0.24 +/- 0.03, and E(V-K) = 1.53 +/- 0.01 mag. The interstellar extinction law is normal in the direction of the cluster. The cluster$^\prime$s estimated age is $\sim$ 251~Myr and the distance is \(724 +/- 5\) pc. The mass function slope was found to be $x$ = $0.57 +/- 0.28$ by considering stars $\geq$ 1 M$_\odot$. Our analysis indicates that the cluster was dynamically relaxed. Furthermore, we identified three new variable stars for the first time in the cluster region using TESS data. These variables belong to the category of slow-pulsating B-type variables with periods of 46.70, 47.92, and 37.56 h.
subject: Research articles
  topic: section
subject: clusters
  topic: keywords
subject: photometric
  topic: keywords
subject: stars
  topic: keywords
subject: variables
  topic: keywords
creator: Vaibhav Kumar Pandey
creator: Arvind Dattatrey
creator: Apara Tripathi
creator: R. Yadav
creator: Shantanu Rastogi
rights: Copyright (c) 2025
date: 2025-09-16
publication date: 2025-09-16
starting page: 35
ending page: 51
doi: 10.22201/ia.01851101p.2025.61.02.04

Deep-TAO: The Deep Learning Transient Astronomical Object data set for Astronomical Transient Event Classification
type: item
description: We present the Deep-learning Transient Astronomical Object (Deep-TAO), a dataset of 1,249,079 annotated images from the Catalina Real-time Transient Survey, including 3,807 transient and 12,500 non-transient sequences. Deep-TAO has been curated to provide a clean, open-access, and user-friendly resource for benchmarking deep learning models. Deep-TAO covers transient classes such as blazars, active galactic nuclei, cataclysmic variables, supernovae, and events of an indeterminate nature. The dataset is publicly available in FITS format, with Python routines and Jupyter notebooks for easy data manipulation. Using Deep-TAO, a baseline Convolutional Neural Network outperformed traditional random forest classifiers trained on light curves, demonstrating its potential for advancing transient classification.
subject: Research articles
  topic: section
subject: catalogues
  topic: keywords
subject: methods: data analysis
  topic: keywords
subject: transients: genera
  topic: keywords
creator: John Suárez-Pérez
creator: Catalina Gómez
creator: Mauricio Neira
creator: Marcela Hernández Hoyos
creator: Pablo Arbeláez
creator: Jaime Forero-Romero
rights: Copyright (c) 2025
date: 2025-09-16
publication date: 2025-09-16
starting page: 25
ending page: 34
doi: 10.22201/ia.01851101p.2025.61.02.03

Asymmetry and Concentration Parameters for Dwarf Late-Type Spiral Galaxies
type: item
description: We analyzed the asymmetry and concentration parameters in a sample of late-type spiral galaxies using V and R broadband images. Asymmetry values were computed for different rotation angles and radii, revealing low asymmetry overall, with smaller values in the inner regions. No preferred angle significantly affected the asymmetry measurements. The concentration indices lie between those of large spirals and irregular galaxies. We compared our sample distribution in the $C{\rm -}A$ plane with other late-type systems (dwarfs and normal spirals). Additionally, we explored the correlations between asymmetry and star formation rate and between concentration and stellar mass, contrasting our results with those of prior studies.
subject: Research articles
  topic: section
subject: galaxies: dwarf
  topic: keywords
subject: galaxies: irregular
  topic: keywords
subject: galaxies: photometry
  topic: keywords
subject: galaxies: star formation
  topic: keywords
subject: galaxies: structure
  topic: keywords
creator: I. Vega-Acevedo
rights: Copyright (c) 2025
date: 2025-09-16
publication date: 2025-09-16
starting page: 11
ending page: 24
doi: 10.22201/ia.01851101p.2025.61.02.02

An Oscillating Rastall Universe Crossing the Phantom Divide Line
type: item
description: A cyclic flat universe with Quintom behavior and a future Big Rip as presented in the framework of Rastall gravity, which is an extension of the standard $\Lambda$CDM model. The Hubble parameter oscillates periodically between positive and negative values in each cycle. Cosmic transit has been simulated through an oscillating time-dependent deceleration parameter and is expected to occur at approximately 8.7~Gyr. Causality is satisfied at all times, except near the initial singularity and the future Big Rip singularity. The apparent horizon, entropy, and other thermodynamic quantities associated with the current model were analyzed. The energy conditions were investigated.
subject: Research articles
  topic: section
subject: Causality
  topic: keywords
subject: Cyclic universe
  topic: keywords
subject: Modified gravity
  topic: keywords
subject: 04.20.Jb
  topic: keywords
subject: 95.35+d
  topic: keywords
subject: Phantom crossing
  topic: keywords
creator: Nasr Ahmed
creator: Anirudh Pradhan
creator: Archana Dixit
rights: Copyright (c) 2025 RMxAA https://creativecommons.org/licenses/by-nc/4.0/
date: 2025-03-17
publication date: 2025-03-17
starting page: 1
ending page: 10
doi: 10.22201/ia.01851101p.2025.61.02.01

Proper motions of L1551 IRS 5 binary system using 7 mm VLA observations
type: item
description: We analyzed high angular resolution observations of the Very Large Array archive at a wavelength of 7 mm made for the L1551 IRS 5 binary system. Six sets of observations, five with the A configuration and one with the B configuration, were used, covering a time span of about 15 years. With these multi-epoch data, we estimated the absolute and relative proper motions of the binary system, which are about 25.1 mas yr-1 (≈ 16.7 km s-1 considering a distance of 140 pc) and 4.2 mas yr-1, respectively. Finally, based on the relative proper motion, we estimated a total mass for the L1551 IRS 5 binary system of 1.7 M⊙ and an orbital period of 246 years.
subject: Research articles
  topic: section
subject: astrometry
  topic: keywords
subject: binaries: general
  topic: keywords
subject: circumstellar matter
  topic: keywords
subject: ISM: individual (L1551 IRS 5)
  topic: keywords
subject: stars: formation
  topic: keywords
subject: Astrophysics - Solar and Stellar Astrophysics
  topic: keywords
subject: Astrophysics - Astrophysics of Galaxies
  topic: keywords
creator: Villa A. M.
creator: Trinidad M. A.
creator: de la Fuente E.
creator: Rodríguez-Esnard T.
rights: Copyright (c)
date: 2017-10-01
publication date: 2017-10-01
starting page: 525
ending page: 531

Infrared characteristics of the BIS catalog objects
type: item
description: We studied several color-color infrared diagrams of the 276 late type stars of the BIS catalog. For 95 of these stars we derived spectral classification from our slit spectroscopy. From the 2MASS color diagram we concluded that none of the sample stars is a dwarf. The WISE 3.4-12 vs 12-22 plot is the best to discriminate the variability type (Mira, irregular and not-variable), as well as carbon stars. IRAS colors are less useful due to the poor quality of the data for most of the BIS stars. Mixed plots involving 2MASS, AKARI and WISE were also explored: the 2MASS-AKARI J-[S09] vs [S09]-[L18] plot is efficient to discriminate carbon and Mira stars. From the color plots and our spectroscopy we can statistically predict that in the whole BIS catalog no other dusty carbon star is present, while a few Miras and CH or R carbon stars could be discovered. Only about 15% of the BIS stars are of early M type.
subject: Research articles
  topic: section
subject: stars: infrared sources
  topic: keywords
subject: stars: late type
  topic: keywords
subject: stars: variables: general
  topic: keywords
subject: Astrophysics - Solar and Stellar Astrophysics
  topic: keywords
creator: Gaudenzi S.
creator: Nesci R.
creator: Rossi C.
creator: Sclavi S.
creator: Gigoyan K. S.
creator: Mickaelian A. M.
rights: Copyright (c)
date: 2017-10-01
publication date: 2017-10-01
starting page: 507
ending page: 514

On the Longevity of current epoch Compact Group-like Associations in a ΛCDM Cosmology
type: item
description: The survival time of initially compact associations of galaxy-size dark matter halos, obtained at the present epoch from a series of ΛCDM cosmological simulations, is studied by means of dynamical N-body simulations. The time evolution of such systems from the present epoch up to 5 Gyr into the future is followed. We find that out of 14 initial compact associations only 1 (≈ 10%) suffers a full merger, and the others still have at least two discernible members in such a time span, although they have suffered multiple mergers. Our results support the hypothesis that the majority of current compact galaxy groups will not suffer a complete merger within the next few gigayears, and that some of them (≈ 10%) may even evolve without a single merger. We conclude that no overmerging problem exists in compact groups.
subject: Research articles
  topic: section
subject: dark matter
  topic: keywords
subject: galaxies: clusters: general
  topic: keywords
subject: galaxies: halos
  topic: keywords
subject: large-scale structure of universe
  topic: keywords
subject: methods: numerical
  topic: keywords
creator: Tamayo F. J.
creator: Aceves H.
rights: Copyright (c)
date: 2017-10-01
publication date: 2017-10-01
starting page: 515
ending page: 524

CANICA: The Cananea Near-Infrared Camera at the 2.1 m OAGH Telescope
type: item
description: The Cananea near-infrared camera (CANICA) is an instrument commissioned at the 2.12 m telescope of the Guillermo Haro Astrophysical Observatory (OAGH) located in Cananea, Sonora, México. CANICA operates in the near-infrared at multiple bands including J(1.24 μm), H(1.63 μm) and K' (2.12 μm) broad-bands. CANICA in located at the Ritchey-Chrétien focal plane of the telescope, reimaging the f/12 beam into f/6 beam. The detector is a 1024 × 1024 HgCdTe HAWAII array of 18.5 μm pixel size, covering a field of view of 5.5 × 5.5 arcmin2, for a plate scale of 0.32 arcsec/pixel. The camera is enclosed in a cryostat, cooled with liquid nitrogen to 77 K. The cryostat contains the collimator, two 15-position filter wheels, single fixed reimaging optics and the detector.
subject: Research articles
  topic: section
subject: infrared: general
  topic: keywords
subject: instrumentation: detectors
  topic: keywords
subject: telescopes
  topic: keywords
creator: Carrasco L.
creator: Hernández Utrera O.
creator: Vázquez S.
creator: Mayya Y. D.
creator: Carrasco E.
creator: Pedraza J.
creator: Castillo-Domínguez E.
creator: Escobedo G.
creator: Devaraj R.
creator: Luna A.
rights: Copyright (c)
date: 2017-10-01
publication date: 2017-10-01
starting page: 497
ending page: 506

Proper motions of the HH 1 jet
type: item
description: We describe a new method for determining proper motions of extended objects, and a pipeline developed for the application of this method. We then apply this method to an analysis of four epochs of [S II] HST images of the HH 1 jet (covering a period of ≈20 yr). We determine the proper motions of the knots along the jet, and make a reconstruction of the past ejection velocity time-variability (assuming ballistic knot motions). This reconstruction shows an "acceleration" of the ejection velocities of the jet knots, with higher velocities at more recent times. This acceleration will result in an eventual merging of the knots in ≈450 yr and at a distance of ≈80'' from the outflow source, close to the present-day position of HH 1.
subject: Research articles
  topic: section
subject: Herbig-Haro objects
  topic: keywords
subject: ISM: individual objects (HH1/2)
  topic: keywords
subject: ISM: jets and outflows
  topic: keywords
subject: ISM: kinematics and dynamics
  topic: keywords
subject: shock waves
  topic: keywords
subject: stars: formation
  topic: keywords
subject: Astrophysics - Solar and Stellar Astrophysics
  topic: keywords
creator: Raga A. C.
creator: Reipurth B.
creator: Esquivel A.
creator: Castellanos-Ramírez A.
creator: Velázquez P. F.
creator: Hernández-Martínez L.
creator: Rodríguez-González A.
creator: Rechy-García J. S.
creator: Estrella-Trujillo D.
creator: Bally J.
creator: González-Gómez D.
creator: Riera A.
rights: Copyright (c)
date: 2017-10-01
publication date: 2017-10-01
starting page: 485
ending page: 495

acceleration of particles
topic: keywords

(ISM:) cosmic rays
topic: keywords

gamma-rays: general
topic: keywords

astroparticle physics
topic: keywords