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. Jofré; 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

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 PrietoT. 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. Jofré, C. Lardo, P. de Laverny, L. Magrini, E. Maiorca, T. Masseron, L. Morbidelli, G. G. Sacco, D. Minniti, M. Zoccali

^*Corresponding author for this work

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

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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

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Howes, L. M., 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

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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, {L. M.} 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 S. Feltzing and A. Vallenari and {Allende Prieto}, C. and T. 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. Jofr{\'e} 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",

note = "Publisher Copyright: {\textcopyright} 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.",

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Howes, LM, 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, Jofré, 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

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

AU - Howes, L. M.

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, S.

AU - Vallenari, A.

AU - Allende Prieto, C.

AU - Bensby, T.

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 - Jofré, 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 - 2014/9/29

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

KW - Stars

UR - http://www.scopus.com/inward/record.url?scp=84923067271&partnerID=8YFLogxK

U2 - 10.1093/mnras/stu1991

DO - 10.1093/mnras/stu1991

M3 - Article

SN - 0035-8711

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

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