Computer Science
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..990..178m&link_type=abstract
FIRST STARS III: First Stars II Conference. AIP Conference Proceedings, Volume 990, pp. 178-180 (2008).
Computer Science
Population Ii Stars, Stellar Atmospheres, Radiative Transfer, Opacity And Line Formation, Origin, Formation, And Abundances Of The Elements, Carbon Stars, S Stars, And Related Types, Abundances, Chemical Composition
Scientific paper
One of the most striking discoveries from large surveys of metal-poor stars is the large fraction of carbon-enhanced metal-poor stars (CEMP). We present here a detailed study from high resolution chemical analysis of a large sample of CEMP. We flrst demonstrate that molecules with carbon have a strong impact on the thermal structure of the atmosphere, on photometry and on the abundances determination. Regarding their heavy element abundance, carbon-enhanced stars split at least in two groups: stars only enriched in s-elements and stars enriched both in s- and r- process elements. The former group is well explained by AGB mass transfer but the origin of the latter remains a mystery. We present here new clues to understand their peculiar abundance pattern.
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