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Signatures of an Intermediate-Age Metal-Rich Bulge Population

Bensby, Thomas LU ; Feltzing, Sofia LU ; Gould, A.; Johnson, J. A.; Asplund, M.; Adén, Daniel LU ; Melendez, J.; Cohen, J. G.; Thompson, I. and Lucatello, S., et al. (2012) Conference on the Galactic Archaeology - Near-Field Cosmology and the Formation of the Milky Way In Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way (Astronomical Society of the Pacific Conference Series) 458. p.203-204
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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organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way (Astronomical Society of the Pacific Conference Series)
volume
458
pages
203 - 204
publisher
Astronomical Society of the Pacific
conference name
Conference on the Galactic Archaeology - Near-Field Cosmology and the Formation of the Milky Way
external identifiers
  • WOS:000309700000054
ISBN
978-1-58381-798-8
language
English
LU publication?
yes
id
fd66e2fa-7878-4848-a7e3-bb05f1bcb567 (old id 3287967)
date added to LUP
2012-12-18 18:31:18
date last changed
2016-04-16 07:22:21
@misc{fd66e2fa-7878-4848-a7e3-bb05f1bcb567,
  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.},
  author       = {Bensby, Thomas and Feltzing, Sofia and Gould, A. and Johnson, J. A. and Asplund, M. and Adén, Daniel and Melendez, J. and Cohen, J. G. and Thompson, I. and Lucatello, S. and Gal-Yam, A.},
  isbn         = {978-1-58381-798-8},
  language     = {eng},
  pages        = {203--204},
  publisher    = {ARRAY(0x9016030)},
  series       = {Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way (Astronomical Society of the Pacific Conference Series)},
  title        = {Signatures of an Intermediate-Age Metal-Rich Bulge Population},
  volume       = {458},
  year         = {2012},
}