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- W2122761120 abstract "The extremely metal-poor stars are the direct descendants of the first generation stars. They carry the chemical signature of the pristine Universe at the time they formed, shortly after the Big Bang. We aim to derive information about extremely metal-poor stars from their observed spectra. Four extremely metal-poor stars were selected from the Sloan Digital Sky Survey (SDSS) and observed during the guaranteed observing time of X-Shooter. The X-Shooter spectra were analysed using an automatic code, MyGIsFOS, which is based on a traditional analysis method. It makes use of a synthetic grid computed from one-dimensional, plane-parallel, hydrostatic model atmospheres. The low metallicity derived from the SDSS spectra is confirmed here. Two kinds of stars are found. Two stars are confirmed to be extremely metal-poor, with no evidence of any enhancement in carbon. The two other stars are strongly enhanced in carbon. We could not derive iron abundance for one of them, while [Ca/H] is below -4.5. Two of the stars are members of the rare population of extremely metal-poor stars low in alpha elements." @default.
- W2122761120 created "2016-06-24" @default.
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- W2122761120 date "2013-11-28" @default.
- W2122761120 modified "2023-10-01" @default.
- W2122761120 title "X-shooter GTO: evidence for a population of extremely metal-poor, alpha-poor stars" @default.
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- W2122761120 doi "https://doi.org/10.1051/0004-6361/201322213" @default.
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