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

Louise M. Howes; Martin Asplund; A. R. Casey; S. C. Keller; David Yong; Gerry Gilmore; Karin Lind; Kim C Worley; Michael Stanley Bessell; Luca Casagrande; Anna F Marino; David M Nataf; C. I. Owen; Gary Stewart Da Costa; B. P. Schmidt; Patrick Tisserand; Sofia Randich; Sofia Feltzing; A. Vallenari; C. Allende Prieto; M. Bergemann

doi:10.1093/mnras/stu1991

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

Louise M. Howes, Martin Asplund, A. R. Casey, S. C. Keller, David Yong, Gerry Gilmore, Karin Lind, Kim C Worley, Michael Stanley Bessell, Luca Casagrande, Anna F Marino, David M Nataf, C. I. Owen, Gary Stewart Da Costa, B. P. Schmidt, Patrick Tisserand, Sofia Randich, Sofia Feltzing, A. Vallenari, C. Allende PrietoM. Bergemann

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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 [a/Fe] ratios.

Original language	English
Pages (from-to)	4241-4246
Number of pages	6
Journal	Monthly Notices of the Royal Astronomical Society
Volume	445
Issue number	4
DOIs	https://doi.org/10.1093/mnras/stu1991
Publication status	Published - 29 Sept 2014
Externally published	Yes

Keywords

Abundances-stars
Bulge-Galaxy
Evolution
Population II-Galaxy
Stars

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Howes, L. M., Asplund, M., Casey, A. R., Keller, S. C., Yong, D., Gilmore, G., Lind, K., Worley, K. C., Bessell, M. S., Casagrande, L., Marino, A. F., Nataf, D. M., Owen, C. I., Da Costa, G. S., Schmidt, B. P., Tisserand, P., Randich, S., Feltzing, S., Vallenari, A., ... Bergemann, M. (2014). The Gaia-ESO Survey: the most metal-poor stars in the Galactic bulge. Monthly Notices of the Royal Astronomical Society, 445(4), 4241-4246. https://doi.org/10.1093/mnras/stu1991

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title = "The Gaia-ESO Survey: the most metal-poor stars in the Galactic bulge",

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 [a/Fe] ratios.",

keywords = "Abundances-stars, Bulge-Galaxy, Evolution, Population II-Galaxy, Stars",

author = "Howes, {Louise M.} and Martin Asplund and Casey, {A. R.} and Keller, {S. C.} and David Yong and Gerry Gilmore and Karin Lind and Worley, {Kim C} and Bessell, {Michael Stanley} and Luca Casagrande and Marino, {Anna F} and Nataf, {David M} and Owen, {C. I.} and {Da Costa}, {Gary Stewart} and Schmidt, {B. P.} and Patrick Tisserand and Sofia Randich and Sofia Feltzing and A. Vallenari and {Allende Prieto}, C. and M. Bergemann",

year = "2014",

month = sep,

day = "29",

doi = "10.1093/mnras/stu1991",

language = "English",

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Howes, LM, Asplund, M, Casey, AR, Keller, SC, Yong, D, Gilmore, G, Lind, K, Worley, KC, Bessell, MS, Casagrande, L, Marino, AF, Nataf, DM, Owen, CI, Da Costa, GS, Schmidt, BP, Tisserand, P, Randich, S, Feltzing, S, Vallenari, A, Allende Prieto, C & Bergemann, M 2014, 'The Gaia-ESO Survey: the most metal-poor stars in the Galactic bulge', Monthly Notices of the Royal Astronomical Society, vol. 445, no. 4, pp. 4241-4246. https://doi.org/10.1093/mnras/stu1991

TY - JOUR

T1 - The Gaia-ESO Survey

T2 - the most metal-poor stars in the Galactic bulge

AU - Howes, Louise M.

AU - Asplund, Martin

AU - Casey, A. R.

AU - Keller, S. C.

AU - Yong, David

AU - Gilmore, Gerry

AU - Lind, Karin

AU - Worley, Kim C

AU - Bessell, Michael Stanley

AU - Casagrande, Luca

AU - Marino, Anna F

AU - Nataf, David M

AU - Owen, C. I.

AU - Da Costa, Gary Stewart

AU - Schmidt, B. P.

AU - Tisserand, Patrick

AU - Randich, Sofia

AU - Feltzing, Sofia

AU - Vallenari, A.

AU - Allende Prieto, C.

AU - Bergemann, M.

PY - 2014/9/29

Y1 - 2014/9/29

N2 - 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 [a/Fe] ratios.

AB - 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 [a/Fe] ratios.

KW - Abundances-stars

KW - Bulge-Galaxy

KW - Evolution

KW - Population II-Galaxy

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VL - 445

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

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

Abstract

Keywords

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