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First Stars III
Contact:
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Poster
Title: Stellar nucleosynthesis in the Galactic history : the carbon stars Author(s): Thomas Masseron Abstract: I will present results from high resolution chemical analysis of a large sample of metal-poor carbon enhanced stars. I will first demonstrate the impact of molecules on the thermal structure of the atmosphere, on photometry and on the abundance determination. I will also discuss abundance results from the extended sample. I will especially focus on the heavy element abundances. It appears indeed that carbon enhanced stars split into two groups: stars only enriched in s- elements and stars enriched both in s- and r-elements. The former group is well explained by AGB mass transfer but the origin of the latter remains a mystery. I will present new clues to understand their peculiar abundance pattern.
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