Looking for imprints of the first stellar generations in metal-poor bulge field stars ⋆

Author： Siqueira-Mello C.   Chiappini C.   Barbuy B.   Freeman K.   Ness M.   Depagne E.   Cantelli E.   Pignatari M.   Hirschi R.   Frischknecht U.   Meynet G.   Maeder A.  

Publisher： Edp Sciences

E-ISSN： 1432-0746|593|issue|A79-A79

ISSN： 0004-6361

Source： Astronomy & Astrophysics, Vol.593, Iss.issue, 2016-09, pp. : A79-A79

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

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Abstract

Context. Efforts to look for signatures of the first stars have concentrated on metal-poor halo objects. However, the low end of the bulge metallicity distribution has been shown to host some of the oldest objects in the Milky Way and hence this Galactic component potentially offers interesting targets to look at imprints of the first stellar generations. As a pilot project, we selected bulge field stars already identified in the ARGOS survey as having [Fe/H] ≈−1 and oversolar [α/Fe] ratios, and we used FLAMES-UVES to obtain detailed abundances of key elements that are believed to reveal imprints of the first stellar generations.

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