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The Frequency of Carbon Rich Stars Among Extremely Metal Poor Stars

Published online by Cambridge University Press:  23 December 2005

Judith G. Cohen ,
Stephen Shectman ,
Ian Thompson ,
Andrew McWilliam ,
Norbert Christlieb ,
Jorge Melendez ,
Franz-Josef Zickgraf ,
Solange Ramírez  and
Amber Swenson
Judith G. Cohen
Affiliation:
Palomar Observatory, MC 105-24, California Institute of Technology, Pasadena, CA 91125, email: [email protected]
Stephen Shectman
Affiliation:
Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101
Ian Thompson
Affiliation:
Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101
Andrew McWilliam
Affiliation:
Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101
Norbert Christlieb
Affiliation:
Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, D-21029 Hamburg
Jorge Melendez
Affiliation:
Palomar Observatory, MC 105-24, California Institute of Technology, Pasadena, CA 91125, email: [email protected]
Franz-Josef Zickgraf
Affiliation:
Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, D-21029 Hamburg
Solange Ramírez
Affiliation:
Spitzer Science Center, MC 100-22, California Institute of Technology, Pasadena, CA 91125
Amber Swenson
Affiliation:
Palomar Observatory, MC 105-24, California Institute of Technology, Pasadena, CA 91125, email: [email protected]
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Abstract

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We discuss the fraction of carbon stars (C-stars) and of C-enhanced stars among samples of candidate extremely metal poor (EMP: [Fe/H] $\le -3.0$ dex) stars selected from the Hamburg/ESO Survey (HES), obtaining a total for C-rich stars with [C/Fe] $\ge$ +1.0 dex of 14.4$\pm4$%. We also present the key results of detailed abundance analyses of a sample of 14 C-stars selected in this way.

Keywords

Stars: carbonstars: abundancesstars: chemically peculiaracute
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S228: From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution , May 2005 , pp. 213 - 218
Copyright
© 2005 International Astronomical Union

Footnotes

Based in part on observations obtained at the W.M. Keck Observatory, which is operated jointly by the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration.