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Chemical Composition of the Galactic Bulge in Baade's Window

Published online by Cambridge University Press:  09 March 2010

Andrew McWilliam ,
Jon Fulbright  and
R. Michael Rich
Andrew McWilliam
Affiliation:
Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA, USA email: andy@obs.carnegiescience.edu
Jon Fulbright
Affiliation:
Johns Hopkins University, Physics & Astronomy, N. 3400 Charles St., Baltimore, MD, USA
R. Michael Rich
Affiliation:
University of California, Los Angeles, Physics & Astronomy, 430 Portola Plaza, Box 951547, Los Angeles, CA, USA
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Abstract

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1. McWilliam and Zoccali (2009) show the existence of two Red Clump populations towards the Galactic bulge, based on 2MASS data. 2.Measured [Mg/Fe], [Al/Fe], and [La/Eu] ratios in the bulge are consistent with a rapid formation timescale (<1Gyr), which also requires a slightly top-heavy IMF to reproduce the mean bulge metallicity. The [C/O] and [O/Fe] ratios are consistent if their predicted metal-dependent yields from massive stars with winds are considered. The decline in explosive [α/Fe] (Si, Ca, and Ti) can only be understood if their yields also decline with metallicity above [Fe/H]~−1.

Keywords

stars: abundancesGalaxy: abundancesGalaxy: bulgenucleosynthesis

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