Variable yields and the problem of nitrogen production

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Abundance, Metallicity, Molecular Clouds, Nitrogen, Stellar Evolution, Stellar Models, Galaxies, H Ii Regions, Oxygen, Stellar Mass

Scientific paper

The author studies the effect of metal-dependent stellar models on chemical yields and in particular on the history of nitrogen and oxygen abundances. He finds that N yield decreases with increasing metal content. This effect somewhat balances the growth of secondary enrichment in nitrogen and leads to a relation between oxygen and nitrogen in fair agreement with observational data for galactic H II regions.

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