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Sofia Feltzing. Profile photo.

Sofia Feltzing

Professor

Sofia Feltzing. Profile photo.

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

Author

  • T. Bensby
  • S. Feltzing
  • A. Gould
  • J. C. Yee
  • J. A. Johnson
  • M. Asplund
  • J. Meléndez
  • S. Lucatello
  • L. M. Howes

Summary, in English

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.

Department/s

  • Lund Observatory
  • eSSENCE: The e-Science Collaboration

Publishing year

2017

Language

English

Pages

86-89

Publication/Series

Proceedings of the International Astronomical Union

Volume

13

Issue

S334

Document type

Journal article

Publisher

Cambridge University Press

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • Galaxy: abundances
  • Galaxy: disk
  • Galaxy: evolution
  • Galaxy: structure

Status

Published

ISBN/ISSN/Other

  • ISSN: 1743-9213