Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011rmxaa..47..139c&link_type=abstract
Revista Mexicana de Astronomía y Astrofísica Vol. 47, pp. 139-158 (2011) (http://www.astroscu.unam.mx/~rmaa/)
Astronomy and Astrophysics
Astronomy
5
Galaxies: Abundances, Galaxies: Evolution, Galaxy: Bulge, H Ii Regions, Ism: Abundances, Sun: Abundances
Scientific paper
We present chemical evolution models of the Galactic disk with different Z-dependent yields. We find that a moderate mass loss rate for massive stars of solar metallicity produces an excellent fit to the observed C/H and C/O gradients of the Galactic disk. The best model also fits: the H, He, C, and O abundances derived from recombination lines of M17, the protosolar abundances, and the C/O-O/H, C/Fe-Fe/H, and O/Fe-Fe/H relations derived from solar vicinity stars. The agreement of the model with the protosolar abundances implies that the Sun originated at a Galactocentric distance similar to the one it has now. Our model for r = 3 kpc implies that a fraction of the stars in the direction of the bulge formed in the inner disc. We obtain a good agreement between our model and the C/O versus O/H relationship derived from extragalactic H II regions in spiral galaxies.
Carigi Leticia
Peimbert Manuel
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