Abundance Ratios in the Galactic Bulge and Super Metal-Rich Type II Nucle osynthesis

Details Abundance Ratios in the Galactic Bulge and Super Metal-Rich Type II Nucle osynthesis Abundance Ratios in the Galactic Bulge and Super Metal-Rich Type II Nucle osynthesis

2004-11-01

arxiv.org/abs/astro-ph/0411041v1

Nucl.Phys. A758 (2005) 197-200

Astronomy and Astrophysics

Astrophysics

Conference proceeding to Nuclei in the Cosmos VIII, Vancouver, BC, July, 2004. Based on data obtained at the W. M. Keck Observ

Scientific paper

10.1016/j.nuclphysa.2005.05.037

We present abundance results from our Keck/HIRES observations of giants in the Galactic Bulge. We confirm that the metallicity distribution of giants in the low-reddening bulge field Baade's Window can be well-fit by a closed-box enrichment model. We also confirm previous observations that find enhanced [Mg/Fe], [Si/Fe] and [Ca/Fe] for all bulge giants, including those at super-solar metallicities. However, we find that the [O/Fe] ratios of metal-rich bulge dwarfs decrease with increasing metallicity, contrary to what is expected if the enhancements of the other $\alpha$-elements is due to Type II supernovae enrichment. We suggest that the decrease in oxygen production may be due to mass loss in the pre-supernova evolution of metal-rich progenitors.

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