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Caffau (1, F. Hammer (2), F. Spite (2), H.-G. Ludwig (1, Laboratoire Cassiop\\'e e, Landessternwarte, L. Monaco (5), L. Sbordone (1, M. Spite (2), Observatoire de la C\\^ote d'Azur, Observatoire de Paris, P. Bonifacio (2), P. Fran\\c{c}ois (2, P. Molaro (9), R. Cayrel (2), S. Randich (7), S. Zaggia (4), Universit\\'e de Picardie Jules Verne, Univ. Paris Diderot, V. Hill (8)","submitted_at":"2011-09-05T20:00:02Z","abstract_excerpt":"Context: Extremely metal-poor stars (EMP) are very rare objects that hold in their atmospheres the fossil record of the chemical composition of the early phases of Galactic evolution. Finding these objects and determining their chemical composition provides important constraints on these early phases. 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