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Detailed analyses of three neutron-capture-rich carbon-enhanced metal-poor stars

Published online by Cambridge University Press:  09 March 2010

N. T. Behara ,
P. Bonifacio ,
H.-G. Ludwig ,
L. Sbordone ,
J. I. González Hernández  and
E. Caffau
N. T. Behara
Affiliation:
CIFIST Marie Curie Excellence Team GEPI, Observatoire de Paris CNRS, Université Paris Diderot
P. Bonifacio
Affiliation:
CIFIST Marie Curie Excellence Team GEPI, Observatoire de Paris CNRS, Université Paris Diderot Istituto Nazionale di Astrofisica - Osservatorio Astronomico di Trieste email: [email protected]
H.-G. Ludwig
Affiliation:
CIFIST Marie Curie Excellence Team GEPI, Observatoire de Paris CNRS, Université Paris Diderot
L. Sbordone
Affiliation:
CIFIST Marie Curie Excellence Team GEPI, Observatoire de Paris CNRS, Université Paris Diderot
J. I. González Hernández
Affiliation:
CIFIST Marie Curie Excellence Team GEPI, Observatoire de Paris CNRS, Université Paris Diderot
E. Caffau
Affiliation:
GEPI, Observatoire de Paris CNRS, Université Paris Diderot
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Abstract

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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.

Keywords

stars: abundancesstars: fundamental parametersstars: AGB and post-AGB
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S265: Chemical Abundances in the Universe: Connecting First Stars to Planets , August 2009 , pp. 122 - 123
Copyright
Copyright © International Astronomical Union 2010

References

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