The Gaia-ESO Survey: The most metal-poor stars in the Galactic bulge
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Fecha
2014
Profesor/a Guía
Facultad/escuela
Idioma
en
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Nombre de Curso
Licencia CC
Atribución 4.0 Internacional (CC BY 4.0)
Licencia CC
https://creativecommons.org/licenses/by/4.0/deed.es
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. © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Notas
Indexación: Scopus
Palabras clave
Abundances-stars, Bulge-Galaxy, Evolution, Population II-Galaxy, Stars
Citación
DOI
10.1093/mnras/stu1991