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Behara, N T; Bonifacio, P; H -G Ludwig; Sbordone, L; Gonzalez Hernandez, J I; Caffau, E
arXiv.org, 09/2009Paper, Journal Article
Approximately 20% of very metal-poor stars (Fe/H < -2.0) are strongly enhanced in carbon (C/Fe > +1.0). Such stars are referred to as carbon-enhanced metal-poor (CEMP) stars. We present a chemical abundance analysis based on high resolution spectra acquired with UVES at the VLT of three dwarf CEMP stars: SDSS J1349-0229, SDSS J0912+0216 and SDSS J1036+1212. These very metal-poor stars, with Fe/H < -2.5, were selected from our ongoing survey of extremely metal-poor dwarf candidates from the SDSS. Among these CEMPs, SDSS J1349-0229 has been identified as a carbon star (C/O > +1.0). First and second peak s-process elements, as well as second peak r-process elements have been detected in all stars. In addition, elements from the third r-process peak were detected in one of the stars, SDSS J1036+1212. We present the abundance results of these stars in the context of neutron-capture nucleosynthesis theories.
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in: SICRIS
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