| Autor: |
Masseron, Thomas |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 3/11/2008, Vol. 990 Issue 1, p178-180, 3p, 4 Graphs |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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