Nucleosynthetic signatures of the first stars

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dc.creatorFrebel, Anna
dc.creatorAoki, Wako
dc.creatorChristlieb, Norbert
dc.creatorAndo, Hiroyasu
dc.creatorAsplund, Martin
dc.creatorBarklem, Paul S.
dc.creatorBeers, Timothy C.
dc.creatorEriksson, Kjell
dc.creatorFechner, Cora
dc.creatorFujimoto, Masayuki Y.
dc.creatorHonda, Satoshi
dc.creatorKajino, Toshitaka
dc.creatorMinezaki, Takeo
dc.creatorNomoto, Ken`ichi
dc.creatorNorris, John E.
dc.creatorRyan, Sean G.
dc.creatorTakada-Hidai, Masahide
dc.creatorTsangarides, Stelios
dc.creatorYoshii, Yuzuru
dc.date2005-03-01
dc.date2005-04-05
dc.date.accessioned2026-07-07T02:17:07Z
dc.date.available2026-07-07T02:17:07Z
dc.descriptionThe chemically most primitive stars provide constraints on the nature of the first stellar objects that formed in the Universe; elements other than hydrogen, helium and traces of lithium within these objects were generated by nucleosynthesis in the very first stars. The relative abundances of elements in the surviving primitive stars reflect the masses of the first stars, because the pathways of nucleosynthesis are quite sensitive to stellar masses. Several models have been suggested to explain the origin of the abundance pattern of the giant star HE 0107-5240, which hitherto exhibited the highest deficiency of heavy elements known. Here we report the discovery of HE 1327-2326, a subgiant or main-sequence star with an iron abundance about a factor of two lower than that of HE 0107-5240. Both stars show extreme overabundances of carbon and nitrogen with respect to iron, suggesting a similar origin of the abundance patterns. The unexpectedly low Li and high Sr abundances of HE 1327-2326, however, challenge existing theoretical understanding: none predicts the high Sr abundance or provides a Li depletion mechanism consistent with data available for the most metal-poor stars.
dc.description9 pages, 2 figures, accepted for publication in Nature; typos corrected
dc.identifierhttps://arxiv.org/abs/astro-ph/0503021
dc.identifierhttp://arxiv.org/abs/astro-ph/0503021
dc.identifierNature 434 (2005) 871-873
dc.identifierdoi:10.1038/nature03455
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/9055
dc.subjectAstrophysics
dc.titleNucleosynthetic signatures of the first stars
dc.typetext

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