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

Howes, Louise LU ; Asplund, M.; Casey, A. R.; Keller, S. C.; Yong, D.; Gilmore, G.; Lind, K.; Worley, C.; Bessell, M. S. and Casagrande, L., et al. (2014) In Monthly Notices of the Royal Astronomical Society 445(4). p.4241-4246
Abstract
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... (More)
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. (Less)
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publication status
published
subject
keywords
stars: abundances, stars: Population II, Galaxy: bulge, Galaxy:, evolution
in
Monthly Notices of the Royal Astronomical Society
volume
445
issue
4
pages
4241 - 4246
publisher
Wiley-Blackwell
external identifiers
  • wos:000346963300071
  • scopus:84923067271
ISSN
1365-2966
DOI
10.1093/mnras/stu1991
language
English
LU publication?
yes
id
b2b4c7fe-8f5a-40ff-b4cd-cd56d5d965e6 (old id 4941369)
date added to LUP
2015-01-26 16:34:05
date last changed
2017-10-01 03:09:02
@article{b2b4c7fe-8f5a-40ff-b4cd-cd56d5d965e6,
  abstract     = {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 &lt;= [Fe/H] &lt;= -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.},
  author       = {Howes, Louise and Asplund, M. and Casey, A. R. and Keller, S. C. and Yong, D. and Gilmore, G. and Lind, K. and Worley, C. and Bessell, M. S. and Casagrande, L. and Marino, A. F. and Nataf, D. M. and Owen, C. I. and Da Costa, G. S. and Schmidt, B. P. and Tisserand, P. and Randich, S. and Feltzing, Sofia and Vallenari, A. and Allende Prieto, C. and Bensby, Thomas and Flaccomio, E. and Korn, A. J. and Pancino, E. and Recio-Blanco, A. and Smiljanic, R. and Bergemann, M. and Costado, M. T. and Damiani, F. and Heiter, U. and Hill, V. and Hourihane, A. and Jofre, P. and Lardo, C. and de laverny, P. and Magrini, L. and Maiorca, E. and Masseron, T. and Morbidelli, L. and Sacco, G. G. and Minniti, D. and Zoccali, M.},
  issn         = {1365-2966},
  keyword      = {stars: abundances,stars: Population II,Galaxy: bulge,Galaxy:,evolution},
  language     = {eng},
  number       = {4},
  pages        = {4241--4246},
  publisher    = {Wiley-Blackwell},
  series       = {Monthly Notices of the Royal Astronomical Society},
  title        = {The Gaia-ESO Survey: the most metal-poor stars in the Galactic bulge},
  url          = {http://dx.doi.org/10.1093/mnras/stu1991},
  volume       = {445},
  year         = {2014},
}