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Nucleosynthesis in the Hyades Open Cluster: Evidence for the Enhanced Depletion of 12C

Published online by Cambridge University Press:  09 March 2010

Simon C. Schuler ,
Jeremy R. King  and
Lih-Sin The
Simon C. Schuler
Affiliation:
National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719, USA email: [email protected]
Jeremy R. King
Affiliation:
Dept. of Physics and Astronomy, Clemson University, 118 Kinard Laboratory, Clemson, SC 29634, USA email: [email protected], [email protected]
Lih-Sin The
Affiliation:
Dept. of Physics and Astronomy, Clemson University, 118 Kinard Laboratory, Clemson, SC 29634, USA email: [email protected], [email protected]
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Abstract

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We present the results of a light element abundance analysis of three solar-type main sequence (MS) dwarfs and three red giant branch (RGB) clump stars in the Hyades open cluster using high-resolution and high signal-to-noise spectroscopy. The CNO abundances of each group (MS or RGB) are in excellent star-to-star agreement and confirm that the giants have undergone first dredge-up mixing. The observed abundances are compared to predictions of a standard stellar model based on the Clemson-American University of Beirut (CAUB) stellar evolution code. The model reproduces the observed evolution of the N and O abundances, as well as the previously derived 12C/13C ratio, but it fails to predict the observed level of 12C depletion in the giants. More tellingly, the sum of the observed giant CNO abundances does not equal that of the dwarfs.

Keywords

nuclear reactionsnucleosynthesisabundances–open clusters and associations: individual (Hyades)stars: abundancesstars: atmospheresstars: evolutionstars: interiors
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. 372 - 373
Copyright
Copyright © International Astronomical Union 2010

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