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Paper: Signatures of an Intermediate-Age Metal-Rich Bulge Population
Volume: 458, Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way
Page: 203
Authors: Bensby, T.; Feltzing, S.; Gould, A.; Johnson, J. A.; Asplund, M.; Adén, D.; Meléndez, J.; Cohen, J. G.; Thompson, I.; Lucatello, S.; Gal-Yam, A.
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 α-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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