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Abundance patterns in stars in the bulge and Galactic center

Published online by Cambridge University Press:  01 July 2007

Katia Cunha ,
V. V. Smith ,
K. Sellgren ,
R. D. Blum ,
S. V. Ramírez  and
D. M. Terndrup
Katia Cunha
Affiliation:
NOAO, Casilla 603, La Serena, Chile email: [email protected]; [email protected]
V. V. Smith
Affiliation:
NOAO, Casilla 603, La Serena, Chile email: [email protected]; [email protected]
K. Sellgren
Affiliation:
The Ohio State University, 140 West 18th Ave., Columbus, OH 43210, USA email: [email protected]; [email protected]
R. D. Blum
Affiliation:
NOAO, 950 N. Cherry Ave., Tucson, AZ 85219, USA email: [email protected]
S. V. Ramírez
Affiliation:
Infrared Processing and Analysis Center, Caltech, Mail Code 100-22, Pasadena, CA 91125, USA email: [email protected]
D. M. Terndrup
Affiliation:
The Ohio State University, 140 West 18th Ave., Columbus, OH 43210, USA email: [email protected]; [email protected]
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Abstract

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We discuss oxygen and iron abundance patterns in K and M red-giant members of the Galactic bulge and in the young and massive M-type stars inhabiting the very center of the Milky Way. The abundance results from the different bulge studies in the literature, both in the optical and the infrared, indicate that the [O/Fe]-[Fe/H] relation in the bulge does not follow the disk relation, with [O/Fe] values falling above those of the disk. Based on these elevated values of [O/Fe] extending to large Fe abundances, it is suggested that the bulge underwent a rapid chemical enrichment with perhaps a top-heavy initial mass function. The Galactic Center stars reveal a nearly uniform and slightly elevated (relative to solar) iron abundance for a studied sample which is composed of 10 red giants and supergiants. Perhaps of more significance is the fact that the young Galactic Center M-type stars show abundance patterns that are reminiscent of those observed for the bulge population and contain enhanced abundance ratios of α-elements relative to either the Sun or Milky Way disk at near-solar metallicities.

Keywords

nucleosynthesis – stars: abundances – Galaxy: center – Galaxy: bulge
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S245: Formation and Evolution of Galaxy Bulges , July 2007 , pp. 339 - 342
Copyright
Copyright © International Astronomical Union 2008

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