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

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

doi:10.1093/mnras/stu1991

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

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 PrietoThomas 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

Australian National University

Research output: Contribution to journal › Article › peer-review

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.

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

Subject classification (UKÄ)

Astronomy, Astrophysics and Cosmology

Free keywords

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

Access to Document

10.1093/mnras/stu1991

Gaia-ESO Survey
Gilmore, G. (PI), Randich, S. (PI), Feltzing, S. (CoI), Bensby, T. (CoI), Howes, L. (Researcher), Gruyters, P. (Researcher), Ryde, N. (CoI), Stonkute, E. (Researcher) & Ruchti, G. (Researcher)
2012/12/24 → 2022/07/01
Project: Research

Cite this

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

@article{b2b4c7fe8f5a40ffb4cdcd56d5d965e6,

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 [alpha/Fe] ratios.",

keywords = "stars: abundances, stars: Population II, Galaxy: bulge, Galaxy:, evolution",

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

year = "2014",

doi = "10.1093/mnras/stu1991",

language = "English",

volume = "445",

pages = "4241--4246",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "1365-2966",

publisher = "Oxford University Press",

number = "4",

}

Howes, L, Asplund, M, Casey, AR, Keller, SC, Yong, D, Gilmore, G, Lind, K, Worley, C, 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, Bensby, T, Flaccomio, E, Korn, AJ, Pancino, E, Recio-Blanco, A, Smiljanic, R, Bergemann, M, Costado, MT, Damiani, F, Heiter, U, Hill, V, Hourihane, A, Jofre, P, Lardo, C, de laverny, P, Magrini, L, Maiorca, E, Masseron, T, Morbidelli, L, Sacco, GG, Minniti, D & Zoccali, 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: the most metal-poor stars in the Galactic bulge

AU - Howes, Louise

AU - Asplund, M.

AU - Casey, A. R.

AU - Keller, S. C.

AU - Yong, D.

AU - Gilmore, G.

AU - Lind, K.

AU - Worley, C.

AU - Bessell, M. S.

AU - Casagrande, L.

AU - Marino, A. F.

AU - Nataf, D. M.

AU - Owen, C. I.

AU - Da Costa, G. S.

AU - Schmidt, B. P.

AU - Tisserand, P.

AU - Randich, S.

AU - Feltzing, Sofia

AU - Vallenari, A.

AU - Allende Prieto, C.

AU - Bensby, Thomas

AU - Flaccomio, E.

AU - Korn, A. J.

AU - Pancino, E.

AU - Recio-Blanco, A.

AU - Smiljanic, R.

AU - Bergemann, M.

AU - Costado, M. T.

AU - Damiani, F.

AU - Heiter, U.

AU - Hill, V.

AU - Hourihane, A.

AU - Jofre, P.

AU - Lardo, C.

AU - de laverny, P.

AU - Magrini, L.

AU - Maiorca, E.

AU - Masseron, T.

AU - Morbidelli, L.

AU - Sacco, G. G.

AU - Minniti, D.

AU - Zoccali, M.

PY - 2014

Y1 - 2014

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 [alpha/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 [alpha/Fe] ratios.

KW - stars: abundances

KW - stars: Population II

KW - Galaxy: bulge

KW - Galaxy:

KW - evolution

U2 - 10.1093/mnras/stu1991

DO - 10.1093/mnras/stu1991

M3 - Article

SN - 1365-2966

VL - 445

SP - 4241

EP - 4246

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

Subject classification (UKÄ)

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Gaia-ESO Survey

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