Christlieb, Norbert; Bessell, Michael; Beers, Timothy C; Gustafsson, Bengt; Korn, A J; Barklem, Paul S; Karlsson, T; Mizuno-Wiedner, M; Rossi, Silvia
The chemical composition of the most metal-deficient stars largely reflects the composition of the gas from which they formed. These old stars provide crucial clues to the star formation history and the synthesis of chemical elements in the early Universe. They are the local relics of epochs otherwise observable only at very high redshifts1,2; if totally metal-free ('population III') stars could be found, this would allow the direct study of the pristine gas from the Big Bang. Earlier searches...[Show more]
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