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The Gaia-ESO Survey: the most metal-poor stars in the Galactic bulge

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Author

  • Louise Howes
  • M. Asplund
  • A. R. Casey
  • S. C. Keller
  • D. Yong
  • G. Gilmore
  • K. Lind
  • C. Worley
  • M. S. Bessell
  • L. Casagrande
  • A. F. Marino
  • D. M. Nataf
  • C. I. Owen
  • G. S. Da Costa
  • B. P. Schmidt
  • P. Tisserand
  • S. Randich
  • Sofia Feltzing
  • A. Vallenari
  • C. Allende Prieto
  • Thomas Bensby
  • E. Flaccomio
  • A. J. Korn
  • E. Pancino
  • A. Recio-Blanco
  • R. Smiljanic
  • M. Bergemann
  • M. T. Costado
  • F. Damiani
  • U. Heiter
  • V. Hill
  • A. Hourihane
  • P. Jofre
  • C. Lardo
  • P. de laverny
  • L. Magrini
  • E. Maiorca
  • T. Masseron
  • L. Morbidelli
  • G. G. Sacco
  • D. Minniti
  • M. Zoccali
Show all

Summary, in English

We present the first results of the EMBLA survey (Extremely Metal-poor BuLge stars with AAOmega), aimed at finding metal-poor stars in the Milky Way bulge, where the oldest stars should now preferentially reside. EMBLA utilizes SkyMapper photometry to pre-select metal-poor candidates, which are subsequently confirmed using AAOmega spectroscopy. We describe the discovery and analysis of four bulge giants with -2.72 <= [Fe/H] <= -2.48, the lowest metallicity bulge stars studied with high-resolution spectroscopy to date. Using FLAMES/UVES spectra through the Gaia-ESO Survey we have derived abundances of twelve elements. Given the uncertainties, we find a chemical similarity between these bulge stars and halo stars of the same metallicity, although the abundance scatter may be larger, with some of the stars showing unusual [alpha/Fe] ratios.

Publishing year

2014

Language

English

Pages

4241-4246

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

445

Issue

4

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • stars: abundances
  • stars: Population II
  • Galaxy: bulge
  • Galaxy:
  • evolution

Status

Published

Project

  • Gaia-ESO Survey

ISBN/ISSN/Other

  • ISSN: 1365-2966