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

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Resumen

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.

Idioma original	Inglés
Páginas (desde-hasta)	4241-4246
Número de páginas	6
Publicación	Monthly Notices of the Royal Astronomical Society
Volumen	445
N.º	4
DOI	https://doi.org/10.1093/mnras/stu1991
Estado	Publicada - 29 sep. 2014

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Astronomía y astrofísica
Ciencias planetarias y espacial

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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

@article{d3de260c397041ad873c294d705e221e,

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.",

year = "2014",

month = sep,

day = "29",

doi = "10.1093/mnras/stu1991",

language = "English",

volume = "445",

pages = "4241--4246",

journal = "Monthly Notices 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, n.º 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

AN - SCOPUS:84923067271

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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