%0 Journal Article
%T Signatures of an intermediate-age metal-rich bulge population
%A T. Bensby
%A S. Feltzing
%A A. Gould
%A J. A. Johnson
%A M. Asplund
%A D. Ad¨Śn
%A J. Mel¨Śndez
%A J. G. Cohen
%A I. Thompson
%A S. Lucatello
%A A. Gal-Yam
%J Physics
%D 2012
%I arXiv
%X 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.
%U http://arxiv.org/abs/1201.2013v1