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The Chemical Composition of Cool Stars: II - The Hydrogen Deficient Stars

Published online by Cambridge University Press:  12 April 2016

David L. Lambert
David L. Lambert*
Affiliation:
Department of AstronomyThe University of TexasAustin, TX 78712USA

Abstract

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The chemical composition of the R Coronae Borealis and cool hydrogen deficient carbon stars is reviewed. Similarities and differences between these stars and the hot He stars are noted. Proposed origins for the hydrogen deficient stars are sketched. Recent claims that normal (spectral type N) cool carbon stars are hydrogen deficient are shown to be unfounded. Attention is drawn to the curious case of pop. II variables (RV Tauri, W Virginis, and RR Lyrae stars) whose atmospheres show striking deficiencies of heavy elements and may be hydrogen deficient.

Type
IV Cool Hydrogen Deficient Stars
Information
International Astronomical Union Colloquium , Volume 87: Hydrogen Deficient Stars and Related Objects , 1985 , pp. 126 - 150
Copyright
Copyright © Reidel 1986

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