Signatures of an Intermediate-Age Metal-Rich Bulge Population

Thomas Bensby; Sofia Feltzing; A. Gould; J. A. Johnson; M. Asplund; Daniel Adén; J. Melendez; J. G. Cohen; I. Thompson; S. Lucatello; A. Gal-Yam

Signatures of an Intermediate-Age Metal-Rich Bulge Population

Thomas Bensby, Sofia Feltzing, A. Gould, J. A. Johnson, M. Asplund, Daniel Adén, J. Melendez, J. G. Cohen, I. Thompson, S. Lucatello, A. Gal-Yam

Research output: Chapter in Book/Report/Conference proceeding › Paper in conference proceeding › peer-review

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.

Original language	English
Title of host publication	Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way (Astronomical Society of the Pacific Conference Series)
Publisher	Astronomical Society of the Pacific (ASP)
Pages	203-204
Volume	458
ISBN (Print)	978-1-58381-798-8
Publication status	Published - 2012
Event	Conference on the Galactic Archaeology - Near-Field Cosmology and the Formation of the Milky Way - Shezenji, JAPAN Duration: 2011 Nov 1 → 2011 Nov 4

Publication series

Name
Volume	458

Conference

Conference	Conference on the Galactic Archaeology - Near-Field Cosmology and the Formation of the Milky Way
Period	2011/11/01 → 2011/11/04

Subject classification (UKÄ)

Astronomy, Astrophysics and Cosmology

Cite this

Bensby, T., Feltzing, S., Gould, A., Johnson, J. A., Asplund, M., Adén, D., Melendez, J., Cohen, J. G., Thompson, I., Lucatello, S., & Gal-Yam, A. (2012). Signatures of an Intermediate-Age Metal-Rich Bulge Population. In Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way (Astronomical Society of the Pacific Conference Series) (Vol. 458, pp. 203-204). Astronomical Society of the Pacific (ASP).

@inproceedings{fd66e2fa78784848a7e3bb05f1bcb567,

title = "Signatures of an Intermediate-Age Metal-Rich Bulge Population",

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 = "Thomas Bensby and Sofia Feltzing and A. Gould and Johnson, {J. A.} and M. Asplund and Daniel Ad{\'e}n and J. Melendez and Cohen, {J. G.} and I. Thompson and S. Lucatello and A. Gal-Yam",

year = "2012",

language = "English",

isbn = "978-1-58381-798-8",

volume = "458",

publisher = "Astronomical Society of the Pacific (ASP)",

pages = "203--204",

booktitle = "Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way (Astronomical Society of the Pacific Conference Series)",

address = "United States",

note = "Conference on the Galactic Archaeology - Near-Field Cosmology and the Formation of the Milky Way ; Conference date: 01-11-2011 Through 04-11-2011",

}

Bensby, T , Feltzing, S, Gould, A, Johnson, JA, Asplund, M, Adén, D, Melendez, J, Cohen, JG, Thompson, I, Lucatello, S & Gal-Yam, A 2012, Signatures of an Intermediate-Age Metal-Rich Bulge Population. in Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way (Astronomical Society of the Pacific Conference Series). vol. 458, Astronomical Society of the Pacific (ASP), pp. 203-204, Conference on the Galactic Archaeology - Near-Field Cosmology and the Formation of the Milky Way, 2011/11/01.

Signatures of an Intermediate-Age Metal-Rich Bulge Population. / Bensby, Thomas ; Feltzing, Sofia; Gould, A. et al.
Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way (Astronomical Society of the Pacific Conference Series). Vol. 458 Astronomical Society of the Pacific (ASP), 2012. p. 203-204.

Research output: Chapter in Book/Report/Conference proceeding › Paper in conference proceeding › peer-review

TY - GEN

T1 - Signatures of an Intermediate-Age Metal-Rich Bulge Population

AU - Bensby, Thomas

AU - Feltzing, Sofia

AU - Gould, A.

AU - Johnson, J. A.

AU - Asplund, M.

AU - Adén, Daniel

AU - Melendez, J.

AU - Cohen, J. G.

AU - Thompson, I.

AU - Lucatello, S.

AU - Gal-Yam, A.

PY - 2012

Y1 - 2012

N2 - 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.

AB - 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.

M3 - Paper in conference proceeding

SN - 978-1-58381-798-8

VL - 458

SP - 203

EP - 204

BT - Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way (Astronomical Society of the Pacific Conference Series)

PB - Astronomical Society of the Pacific (ASP)

T2 - Conference on the Galactic Archaeology - Near-Field Cosmology and the Formation of the Milky Way

Y2 - 1 November 2011 through 4 November 2011

ER -

Signatures of an Intermediate-Age Metal-Rich Bulge Population

Abstract

Publication series

Conference

Subject classification (UKÄ)

Fingerprint

Cite this