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Published May 21, 2019 | Submitted
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Signatures of an intermediate-age metal-rich bulge population


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.

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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