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The chemical composition of the very metal-poor carbon dwarf G77-61

Published online by Cambridge University Press:  23 December 2005

Bertrand Plez ,
J.G. Cohen  and
J. Meléndez
Bertrand Plez
Affiliation:
GRAAL, CNRS UMR 5024, cc072, Université Montpellier II, F-34730 Montpellier cedex 5, France; email: plez@graal.univ-montp2.fr
J.G. Cohen
Affiliation:
Department of Astronomy, California Institute of Technology, MS 105-24 Pasadena, Ca 91125; email: jlc@astro.caltech.edu, jorge@astro.caltech.edu
J. Meléndez
Affiliation:
Department of Astronomy, California Institute of Technology, MS 105-24 Pasadena, Ca 91125; email: jlc@astro.caltech.edu, jorge@astro.caltech.edu
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Abstract

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We have determined the chemical composition of the carbon dwarf G77-61, from Keck IR and optical spectra. We present here a new analysis with the oxygen abundance measured for the first time. We show that G77-61 is extremely metal-poor ([Fe/H]$\,{=}\,{-}$4), with large overabundances of C, N and O ([C/Fe] = 3.2, [N/Fe] = 2.2, [O/Fe] = 2.2). It also shows moderate enhancements of Ca and Mg, Na, and Cr of typically 0.5 dex relative to Fe. We discuss the possible origin of these peculiarities.

Keywords

Stars: carbonstars: abundancesstars: Population II