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 (Unpublished) http://resolver.caltech.edu/CaltechAUTHORS:20190521-161528584
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Abstract
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) | ||||||
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| 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. | ||||||
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| Record Number: | CaltechAUTHORS:20190521-161528584 | ||||||
| Persistent URL: | http://resolver.caltech.edu/CaltechAUTHORS:20190521-161528584 | ||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||
| ID Code: | 95657 | ||||||
| Collection: | CaltechAUTHORS | ||||||
| Deposited By: | Tony Diaz | ||||||
| Deposited On: | 21 May 2019 23:18 | ||||||
| Last Modified: | 21 May 2019 23:18 |
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