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

L. M. 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; S. Feltzing; A. Vallenari; C. Allende Prieto; T. 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

doi:10.1093/mnras/stu1991

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

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

L. M. Howes, M. Asplund, A. R. Casey, S. C. Keller, D. Yong, G. Gilmore, K. Lind, C. Worley, M. S. Bessell, L. Casagrande, …

Monthly notices of the Royal Astronomical Society, Vol.445(4), pp.4241-4246

12/21/2014

DOI: 10.1093/mnras/stu1991

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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 metallicity, although the abundance scatter may be larger, with some of the stars showing unusual [alpha/Fe] ratios.

Astronomy & Astrophysics

Physical Sciences

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Title: Subtitle: The Gaia-ESO Survey: the most metal-poor stars in the Galactic bulge
Creators: L. M. Howes - Australian National University
M. Asplund - Australian National University
A. R. Casey - University of Cambridge
S. C. Keller - Australian National University
D. Yong - Australian National University
G. Gilmore - University of Cambridge
K. Lind - Uppsala University
C. Worley - University of Cambridge
M. S. Bessell - Australian National University
L. Casagrande - Australian National University
A. F. Marino - Australian National University
D. M. Nataf - Australian National University
C. I. Owen - Australian National University
G. S. Da Costa - Australian National University
B. P. Schmidt - Australian National University
P. Tisserand - Australian National University
S. Randich - Arcetri Astrophysical Observatory
S. Feltzing - Lund University
A. Vallenari - Osservatorio Astronomico di Padova
C. Allende Prieto - Inst Astrofis Canarias, E-38205 Tenerife, Spain
T. Bensby - Lund University
E. Flaccomio - Osservatorio Astronomico di Palermo
A. J. Korn - Uppsala University
E. Pancino - Osservatorio astronomico di Bologna
A. Recio-Blanco - Univ Nice Sophia Antipolis, CNRS, Observ Cote Azur, Lab Lagrange,UMR7293, F-06304 Nice 4, France
R. Smiljanic - Nicolaus Copernicus Astronomical Center
M. Bergemann - University of Cambridge
M. T. Costado - Instituto de Astrofísica de Andalucía
F. Damiani - Osservatorio Astronomico di Palermo
U. Heiter - Uppsala University
V. Hill - Observatoire de la Côte d’Azur
A. Hourihane - University of Cambridge
P. Jofre - University of Cambridge
C. Lardo - Osservatorio astronomico di Bologna
P. de laverny - Observatoire de la Côte d’Azur
L. Magrini - Arcetri Astrophysical Observatory
E. Maiorca - Arcetri Astrophysical Observatory
T. Masseron - University of Cambridge
L. Morbidelli - Arcetri Astrophysical Observatory
G. G. Sacco - Arcetri Astrophysical Observatory
D. Minniti - Millennium Institute of Astrophysics
M. Zoccali - Millennium Institute of Astrophysics
Resource Type: Journal article
Publication Details: Monthly notices of the Royal Astronomical Society, Vol.445(4), pp.4241-4246
Publisher: Oxford Univ Press
DOI: 10.1093/mnras/stu1991
ISSN: 0035-8711
eISSN: 1365-2966
Number of pages: 6
Grant note: FL110100012; DP120101237 / Australian Research Council 1110393 / Fondecyt; Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT); CONICYT FONDECYT RPG-2012-541 / Leverhulme Trust INAF; Istituto Nazionale Astrofisica (INAF) PFB-06 / BASAL CATA; Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT); CONICYT PIA/BASAL Chilean Ministry for the Economy, Development Premiale VLT 2012 / Ministero dell'Istruzione, dell'Universita e della Ricerca (MIUR); Ministry of Education, Universities and Research (MIUR) IC12009 / Tourism's Programa Iniciativa Cientifica Milenio ESF (European Science Foundation) through the GREAT Research Network Programme 188.B-3002 / La Silla Paranal Observatory
Language: English
Date published: 12/21/2014
Academic Unit: Physics and Astronomy
Record Identifier: 9984701824102771

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