Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.3811c&link_type=abstract
American Astronomical Society, 189th AAS Meeting, #38.11; Bulletin of the American Astronomical Society, Vol. 28, p.1320
Astronomy and Astrophysics
Astronomy
Scientific paper
We have computed closed chemical evolution models to fit O/H, C/O, N/O, Ne/O, Si/O, S/O, Ar/O, Fe/O. Models have the following properties: a) Yields by Woosley & Weaver (1995) and Renzini & Voli (1991); b) Star Formation Rate proportional to the gas mass; and c) Initial Mass Function for M\> 0.5M_sun given by Kroupa, Tout & Gilmore (1993), and normalized to yield various Mgas/Mtotal ratios at the observed O/H value. While the C/O, N/O and Fe/O values imply that the ``age'' of IZw18 is smaller than 3x10(8) years, the Ar/O value implies that it is older than that. We find that in general for very metal poor galaxies the N/O, Si/O, S/O, Ar/O, and Fe/O ratios are sensitive age indicators for objects younger than 10(8) years
Carigi Leticia
Peimbert Manuel
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