The Gaia-ESO Survey: The most metal-poor stars in the Galactic bulge
- 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.
- Allende Prieto C.
- Bensby T.
- Flaccomio E.
- Korn A. J.
- Pancino E.
- Recio-Blanco A.
- Smiljanic R.
- Bergemann M.
- Costado M. T.
- Damiani F.
- Heiter U.
- Hill V.
- Hourihane A.
- Jofre P.
- Lardo C.
- de Laverny P.
- Magrini L.
- Maiorca E.
- Masseron T.
- Morbidelli L.
- Sacco G. G.
- Minniti D.
- Zoccali M.
DOIAbstract
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, althou...
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