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Elemental abundances in the Galactic bulge from microlensed dwarf stars

T. Bensby, S. Feltzing, J. A. Johnson, A. Gould, H. Sana, A. Gal-Yam, M. Asplund, S. Lucatello, J. Meléndez, A. Udalski, D. Kubas, G. James, D. Adén, J. Simmerer

Abstract
We present elemental abundances of 13 microlensed dwarf and subgiant stars in the Galactic bulge, which constitute the largest sample to date. We show that these stars span the full range of metallicity from Fe/H= −0.8 to +0.4, and that they follow well-defined abundance trends, coincident with those of the Galactic thick disc.

Keywords
Galaxy: bulge, Galaxy: abundances, Galaxy: disk, Galaxy: evolution

Chemical Abundances in the Universe: Connecting First Stars to Planets, Proceedings of the International Astronomical Union Symposium
K. Cunha, M. Spite, B. Barbuy

Cambridge University Press
Volume 265, Number 5, Page 346
2010 March

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Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia