The role of binaries in the enrichment of the early Galactic halo

Author： Hansen T. T.   Andersen J.   Nordström B.   Beers T. C.   Placco V. M.   Yoon J.   Buchhave L. A.  

Publisher： Edp Sciences

E-ISSN： 1432-0746|586|issue|A160-A160

ISSN： 0004-6361

Source： Astronomy & Astrophysics, Vol.586, Iss.issue, 2016-02, pp. : A160-A160

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Abstract

Context. The detailed composition of most metal-poor halo stars has been found to be very uniform. However, a fraction of 20−70% (increasing with decreasing metallicity) exhibit dramatic enhancements in their abundances of carbon; these are the so-called carbon-enhanced metal-poor (CEMP) stars. A key question for Galactic chemical evolution models is whether this non-standard composition reflects that of the stellar natal clouds or is due to local, post-birth mass transfer of chemically processed material from a binary companion; CEMP stars should then all be members of binary systems.

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