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Paper: The most Metal-Poor Stars of the Galaxy: Surveys, Abundances, an Implications
Volume: 353, Stellar Evolution at Low Metallicity: Mass Loss, Explosions, Cosmology
Page: 271
Authors: Christlieb, N.
Abstract: I discuss observational techniques for finding the most metal-poor stars of the Galaxy, and limitations of current abundance analyses of such stars. Large parts of the sky have been surveyed for the oldest stars, and future efforts will significantly extend the survey volume. The most heavy element-deficient stars currently known, HE 0107–5240 and HE 1327–2326, both identified in the Hamburg/ESO objective-prism survey (HES), show underabundances of the heavy elements by more than a factor of 100,000 with respect to the Sun, while C, N and O are enhanced by ~ 2–3 orders of magnitude with respect to Fe and the Sun. The peculiar abundance pattern of these two stars is not yet fully understood in the framework of currently available models of stellar evolution and supernova explosions at the lowest metallicities.
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