The Gaia-ESO Survey: the most metal-poor stars in the galactic bulge
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Archivos
Fecha
2014-09
Profesor/a Guía
Facultad/escuela
Idioma
en
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Título del volumen
Editor
Oxford University Press
Nombre de Curso
Licencia CC
Atribution 4.0 International (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 [α/Fe] ratios.
Notas
Indexación: Scopus.
Palabras clave
Stars: Abundances, Stars: Population II, Galaxy: Bulge, Galaxy: Evolution
Citación
Monthly Notices of the Royal Astronomical Society. sVolume 445, Issue 4, Pages 4241 - 4246. 29 September 2014
DOI
DOI: 10.1093/mnras/stu1991