par Behara, Natalie Thérèse ;Bonifacio, Piercarlo;Ludwig, Hans Günter;Sbordone, Luca;Hernández, Jonay I. González;Caffau, Elisabetta
Editeur scientifique Cunha, Katia;Spite, Monique;Barbuy, B.
Référence Chemical Abundances in the Universe: Chemical Abundances in the Universe(10-14 August, 2009: Rio de Janeiro), Chemical Abundances in the Universe, Connecting First Stars to Planet, Cambridge University Press, page (122-123)
Publication Publié, 2010-03
Publication dans des actes
Résumé : 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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