Keywords
Astrophysics
How to Cite
The Red Stellar Contents of Three Selected Fields of the Local Group Dwarf Irregular Galaxy IC 1613. (2000). Revista Mexicana De Astronomía Y Astrofísica, 36(1), 151-160. https://astronomia.unam.mx/journals/rmxaa/article/view/2000rmxaa..36..151b
Abstract
We present a moderately-deep JK photometry for three selected areas of the dwarf irregular galaxy IC 1613. The color-magnitude diagrams contain a mixture of red supergiants, asymptotic giant branch stars and the brightest red giant stars. The red supergiants are massive (20-25 Msolar) and young ---with ages between 8 and 25 Myr. The most important result is the evidence of the decreasing density of the intermediate age AGB population in the vicinity of the H II regions in the galaxy. We also find age differences between AGB stars in the main body of the galaxy and those near the H II regions in the North-East. The former span a range in ages between 1 and 10 Gyr, while the latter are younger than 1 Gyr. Using the period-luminosity relation derived by Madore & Freedman (1991) and JK magnitudes of the Cepheid variable V20, we calculated (m - M)K = 24.37 ± 0.2. The recently discovered Nova (King, Modjaz, & Li 1999) was identified in Field III. Its presence in our images and its brightness questioned its classification as a nova.Similar Articles
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