期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 445, 期 4, 页码 4241-4246出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu1991
关键词
stars: abundances; stars: Population II; Galaxy: bulge; Galaxy: evolution
资金
- Australian Research Council [FL110100012, DP120101237]
- Swedish Research Council [621-2009- 3911]
- Swedish National Space Board
- La Silla Paranal Observatory [188.B-3002]
- European Union through ERC [320360]
- Leverhulme Trust [RPG-2012-541]
- INAF
- Ministero dell'Istruzione, dell'Universita e della Ricerca (MIUR) [Premiale VLT 2012]
- ESF (European Science Foundation) through the GREAT Research Network Programme
- Fondecyt [1110393]
- BASAL CATA [PFB-06]
- Chilean Ministry for the Economy, Development
- Tourism's Programa Iniciativa Cientifica Milenio [IC12009]
- Science and Technology Facilities Council [ST/K000985/1] Funding Source: researchfish
- STFC [ST/K000985/1] Funding Source: UKRI
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.
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