Signatures of an Intermediate-Age Metal-Rich Bulge Population
Bensby, Thomas; Feltzing, Sofia; Gould, A.; Johnson, J. A., et al. (2012). Signatures of an Intermediate-Age Metal-Rich Bulge Population Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way (Astronomical Society of the Pacific Conference Series), 458,, 203 - 204. Conference on the Galactic Archaeology - Near-Field Cosmology and the Formation of the Milky Way: Astronomical Society of the Pacific (ASP)
Conference Proceeding/Paper
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Published
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English
Authors:
Bensby, Thomas
;
Feltzing, Sofia
;
Gould, A.
;
Johnson, J. A.
, et al.
Department:
Lund Observatory - Has been reorganised
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.
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