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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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