Chemical Abundances in our Galaxy and Other Galaxies Derived from H II Regions

Details Chemical Abundances in our Galaxy and Other Galaxies Derived from H II Regions Chemical Abundances in our Galaxy and Other Galaxies Derived from H II Regions

2000-07-20

arxiv.org/abs/astro-ph/0007314v1

Astrophys.Space Sci. 277 (2001) 147-156

Astronomy and Astrophysics

Astrophysics

10 pages, 2 figures. The evolution of Galaxies. I- Observational Clues. Conference Proceedings

Scientific paper

10.1023/A:1012789324221

We discuss the accuracy of the abundance determinations of H II regions in our Galaxy and other galaxies. We focus on the main observational constraints derived from abundance determinations that have implications for models of galactic chemical evolution: a) the helium to hydrogen abundance ratio, He/H; b) the oxygen to hydrogen abundance ratio, O/H; c) the carbon to oxygen abundance ratio, C/O; d) the helium to oxygen and helium to heavy elements abundance ratios, Delta Y/ Delta O and Delta Y/ Delta Z; and e) the primordial helium abundance, Yp.

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