Keywords
Galactic Structure:H II Regions
H II Regions:Galactic Structure
H II Regions:Galactic Structure
How to Cite
Spiral structure and age distribution of the H II regions in the Milky Way. (1987). Revista Mexicana De Astronomía Y Astrofísica, 14(1), 223. https://astronomia.unam.mx/journals/rmxaa/article/view/1987rmxaa..14..223d
Abstract
ABSTRACT. Radioastronomical measurements giving thie ratio R = VHe+/VH+ were used to determine the age of galactic H II regions with ionization parameter U = Uorion = 65 pc cm. Models of evolution of R vs. age show that even when the well known gradient of metallicity is taken into account, a difference arises among the histogram of ages of the three analized arms. The Car-Sag structure is younger than inner Scutt-CruxNorma and the outer Per-Orion spiral arm. Keq wo'tJ : GALAXY-STRUCTURE - NEBULAE-H II REGIONSSimilar Articles
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