Nitrogen and oxygen evolution in dwarf irregular galaxies

Details Nitrogen and oxygen evolution in dwarf irregular galaxies Nitrogen and oxygen evolution in dwarf irregular galaxies

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.217..391m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 217, Nov. 15, 1985, p. 391-405.

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108

Chemical Evolution, Dwarf Galaxies, Galactic Structure, Gas Evolution, Nitrogen, Oxygen, Stellar Evolution, Astronomical Models, Computational Astrophysics, Milky Way Galaxy

Scientific paper

In the present computation of numerical chemical evolution models for a sample of 40 dwarf irregular galaxies, assuming bursts of star formation and taking account of galactic winds, N and O evolution is followed up in light of the most recent results on stellar evolution. The N and O abundances observed are well reproduced by theoretical models with such implications as the ability to explain the N/O vs O diagrams of dwarf irregulars, as well as those of halo stars in the Galaxy, by means of a primary fraction of N ranging from 30 to 50 percent. A Salpeter (1955) initial mass function is applicable to all these galaxies, while functions strongly varying with metallicity do not yield the observed data.

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