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The Frequency of Carbon Rich Stars Among Extremely Metal Poor Stars

  • Judith G. Cohen (a1), Stephen Shectman (a2), Ian Thompson (a2), Andrew McWilliam (a2), Norbert Christlieb (a3), Jorge Melendez (a1), Franz-Josef Zickgraf (a3), Solange Ramírez (a4) and Amber Swenson (a1)...

Abstract

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.

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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.

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The Frequency of Carbon Rich Stars Among Extremely Metal Poor Stars

  • Judith G. Cohen (a1), Stephen Shectman (a2), Ian Thompson (a2), Andrew McWilliam (a2), Norbert Christlieb (a3), Jorge Melendez (a1), Franz-Josef Zickgraf (a3), Solange Ramírez (a4) and Amber Swenson (a1)...

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