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Signatures of an intermediate-age metal-rich bulge population

Bensby, T. and Feltzing, S. and Gould, A. and Johnson, J. A. and Asplund, M. and Adén, D. and Meléndez, J. and Cohen, J. G. and Thompson, I. and Lucatello, S. and Gal-Yam, A. (2012) Signatures of an intermediate-age metal-rich bulge population. . (Unpublished)

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We have determined detailed elemental abundances and stellar ages for a sample of now 38 microlensed dwarf and subgiant stars in the Galactic bulge. Stars with sub-solar metallicities are all old and have enhanced alpha-element abundances -- very similar to what is seen for local thick disk stars. The metal-rich stars on the other hand show a wide variety of stellar ages, ranging from 3-4 Gyr to 12 Gyr, and an average around 7-8 Gyr. The existence of young and metal-rich stars are in conflict with recent photometric studies of the bulge which claim that the bulge only contains old stars.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Cohen, J. G.0000-0002-8039-4673
Gal-Yam, A.0000-0002-3653-5598
Additional Information:T.B. was funded by grant No. 621-2009-3911 from The Swedish Research Council. Work by A.G. was supported by NSF Grant AST0757888.
Funding AgencyGrant Number
Swedish Research Council621-2009-3911
Record Number:CaltechAUTHORS:20190521-161528584
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95657
Deposited By: Tony Diaz
Deposited On:21 May 2019 23:18
Last Modified:03 Oct 2019 21:15

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