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The age and abundance structure of the stellar populations in the central sub-kpc of the Milky Way

Published online by Cambridge University Press:  02 August 2018

T. Bensby ,
S. Feltzing ,
A. Gould ,
J. C. Yee ,
J. A. Johnson ,
M. Asplund ,
J. Meléndez Open the ORCID record for J. Meléndez [Opens in a new window] ,
S. Lucatello  and
L. M. Howes Open the ORCID record for L. M. Howes [Opens in a new window]
T. Bensby
Affiliation:
Lund Observatory, Box 43, SE-221 00 Lund, Sweden
S. Feltzing
Affiliation:
Lund Observatory, Box 43, SE-221 00 Lund, Sweden
A. Gould
Affiliation:
Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany Korea Astronomy and Space Science Institute Institute, Daejon 305-348, Republic of Korea Dept of Astronomy, Ohio State University, 140 W. 18th Avenue, Columbus, OH 43210, USA
J. C. Yee
Affiliation:
Smithsonian Astrophysical Observatory, 60 Garden St., Cambridge, MA 02138, USA
J. A. Johnson
Affiliation:
Dept of Astronomy, Ohio State University, 140 W. 18th Avenue, Columbus, OH 43210, USA
M. Asplund
Affiliation:
Research School of Astronomy & Astrophysics, ANU, Canberra, Australia
J. Meléndez
Affiliation:
Departamento de Astronomia do IAG/USP, Universidade de São Paulo, São Paulo, Brasil
S. Lucatello
Affiliation:
INAF-Astronomical Observatory of Padova, Vicolo dell’Osservatorio 5, 35122 Padova, Italy
L. M. Howes
Affiliation:
Lund Observatory, Box 43, SE-221 00 Lund, Sweden
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Abstract

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The four main findings about the age and abundance structure of the Milky Way bulge based on microlensed dwarf and subgiant stars are: (1) a wide metallicity distribution with distinct peaks at [Fe/H] = -1.09, -0.63, -0.20, +0.12, +0.41; (2) a high fraction of intermediate-age to young stars where at [Fe/H] > 0 more than 35 % are younger than 8 Gyr, (3) several episodes of significant star formation in the bulge 3, 6, 8, and 11 Gyr ago; (4) the ‘knee’ in the α-element abundance trends of the sub-solar metallicity bulge appears to be located at a slightly higher [Fe/H] (about 0.05 to 0.1 dex) than in the local thick disk.

Keywords

Galaxy: diskGalaxy: evolutionGalaxy: structureGalaxy: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S334: Rediscovering our Galaxy , July 2017 , pp. 86 - 89
Copyright
Copyright © International Astronomical Union 2018 

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