Signatures of an intermediate-age metal-rich bulge population

Details Signatures of an intermediate-age metal-rich bulge population Signatures of an intermediate-age metal-rich bulge population

2012-01-10

arxiv.org/abs/1201.2013v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Poster contribution at Galactic archeology, near-field cosmology and the formation of the Milky Way, Shuzenji, Japan, 1-4 Nove

Scientific paper

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.

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