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Carbon-Enhanced, Metal-Poor Stars and Modeling of the Asymptotic Giant Branch

Published online by Cambridge University Press:  05 March 2013

Sara Lucatello ,
Thomas Masseron  and
Jennifer A. Johnson
Sara Lucatello*
Affiliation:
Excellence Cluster Universe, Technische Universität München, Boltzmannstr. 2, D-85748, Garching, Germany INAF-Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, 35122, Padova, Italy
Thomas Masseron
Affiliation:
Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
Jennifer A. Johnson
Affiliation:
Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
*
DCorresponding author. Email: [email protected]
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Abstract

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The very high fraction of C-enriched stars among the low end of the Galactic-halo metallicity distribution, along with the wide variety in content of their neutron-capture elements, make the understanding of their formation scenario(s) of extreme interest. The combination of accurate determinations of their chemical composition with long-term radial-velocity monitoring is crucial to address this issue. We discuss the first results of long-term radial-velocity monitoring for C-enhanced, metal-poor stars and explore the connection with chemical peculiarities; the data suggest that belonging to a close binary affects nucleosynthesis on the Asymptotic Giant Branch. We also present abundances for the poorly studied element fluorine in a sample of 10 C-enhanced stars with metallicities ranging from [Fe/H] = –1.3 to –2.9 and compare our measurements to the predictions of state-of-the-art nucleosynthesis models. We show how the observed abundances of fluorine in CEMP stars are considerable lower than expected on the basis of the current state-of-the-art theoretical calculations, hinting at our poor understanding of the nucleosynthetic processes that produce this element.

Keywords

binaries: generalstars: AGB and post AGBstars: carbon
Type
CEMP Stars
Information
Publications of the Astronomical Society of Australia , Volume 26 , Issue 3 , 2009 , pp. 303 - 310
Copyright
Copyright © Astronomical Society of Australia 2009

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