Abundance ratios in the galactic bulge and super metal-rich type II nucleosynthesis: Pitfalls of the analysis

被引：14

作者：

Fulbright, JP ^{[1
]}

Rich, RM

McWilliam, A

机构：

[1] Observ Carnegie Inst Washington, Pasadena, CA 91101 USA

[2] Univ Calif Los Angeles, Los Angeles, CA USA

来源：

NUCLEAR PHYSICS A | 2005年 / 758卷

关键词：

D O I：

10.1016/j.nuclphysa.2005.05.037

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

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 a-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.

引用

页码：197C / 200C

页数：4

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