Carbon and Oxygen Galactic Abundance Gradients: A Comparative Study of Stellar Yields
| dc.creator | Carigi, Leticia | |
| dc.date | 2000-05-02 | |
| dc.date | 2000-09-27 | |
| dc.date.accessioned | 2026-07-07T01:53:20Z | |
| dc.date.available | 2026-07-07T01:53:20Z | |
| dc.description | Chemical evolution models for the Galactic disk under an inside-out formation scenario are presented for seven sets of stellar yields, all of them metal dependent. In particular, the effects of yields from massive and low-and-intermediate-mass stars on the C/O chemical history of the solar neighborhood and on abundance gradients are discussed comparing the predictions with abundance ratios from nearby HII regions, B-stars, dwarf stars, and the Sun. In the solar vicinity, the increase of C/O with metallicity is due to massive stars alone. Models with yields by Maeder (1992) or by Portinari, Chiosi, & Bressan (1998) reproduce the observed C/O increase with metallicity, while models assuming yields by Woosley & Weaver (1995) and Woosley, Langer, & Weaver (1993) do not. Models based on yields by Maeder (1992) are in agreement with the C/O gradient, while those based on yields by Portinari et al. (1998) or by Woosley & Weaver (1995) and Woosley et al. (1993) are not. To match both, the C/O enrichment history of the solar neighborhood and the C/O local gradient, models call for: i) yields that take into account metal-dependent stellar winds; and ii) for massive stars, a mass-loss rate with a metallicity dependence not as simple as Z^{0.5}. C/O abundance ratios predicted with yields by Marigo, Bressan, & Chiosi (1996, 1998) are higher than those with yields by Renzini & Voli (1981), which in turn are higher than those with yields by the van den Hoek & Groenewegen (1997). | |
| dc.description | 30 pages, 5 figures. To appear in Rev. Mex. Astron. Astrof., volumen 36, October | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0005042 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0005042 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/932 | |
| dc.subject | Astrophysics | |
| dc.title | Carbon and Oxygen Galactic Abundance Gradients: A Comparative Study of Stellar Yields | |
| dc.type | text |