Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..587l&link_type=abstract
In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J
Astronomy and Astrophysics
Astronomy
Stellar Abundances
Scientific paper
The unexpectedly large frequency of carbon-enhanced stars at very low metallicity (up to ~30% at [Fe/H] < -2.5) which has been reported by several ongoing wide-field spectroscopic surveys (e.g. the HK survey of Beers and colleagues and the HES of Christlieb and colleagues) is still unexplained as are the range of mechanisms responsible for the production of carbon in the few extremely metal-poor carbon-enhanced stars that have been studied to date at high-resolution. The results of the follow-up work to date seem to suggest that there are different kinds of carbon-enhanced stars (exhibiting besides carbon enhancement s- and r-process element enhancement as well as normal n-capture elemental abundances) hence possibly as many carbon production mechanisms.
To shed light on such mechanisms and on the nucleosynthesis of n-capture elements at low metallicity an increase of the sample of extremely metal-poor carbon-enhanced stars is crucial. We present a homogeneous abundance analysis for 11 previously unstudied extremely metal-poor carbon-enhanced stars based on high-signal-to-noise high-resolution spectroscopy obtained with HIRES at Keck UVES at ESO VLT and SARG at TNG. We also discuss the binary frequency among these objects and explore the possibility of a relationship between the orbital periods and the observed abundance patterns.
Beers Timothy C.
Carretta Eugenio
Christlieb Nn.
Cohen Judith Gamora
Gratton Raffaele G.
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