tokens: This research has been supported by the National Science Foundation under grants PHY 11-25915 and AST 11-09174. This project was also supported by JINA (NSF grant PHY 08-22648). FH and DV acknowledge funding from Natural Sciences and Engineering Research Council of Canada. PD is grateful to the staff of the Max-Planck-Institut für Astrophysik, where this project was completed, for their warm hospitality. We thank M. Salaris who has generously provided us with the Sbordone et al. bolometric corrections.
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