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Abundance Patterns in White Dwarfs

Published online by Cambridge University Press:  19 July 2016

James Liebert
James Liebert*
Affiliation:
Steward Observatory University of Arizona Tucson, AZ 85721 USA

Abstract

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Various evidence indicates that the atmospheric compositions of white dwarfs may switch from hydrogen- to helium- dominated, and vice versa, over wide ranges of surface temperature (luminosity). This envelope evolution may be understood only by assuming that the hydrogen (DA) sequence retains only a tiny residual mass of hydrogen, many orders of magnitude less than that predicted by stellar evolution theory. A corresponding problem may exist for the helium envelopes of some lot stars with helium-rich atmospheres.

Type
White Dwarfs
Information
Symposium - International Astronomical Union , Volume 145: Evolution of Stars: The Photospheric Abundance Connection , 1991 , pp. 411 - 419
Copyright
Copyright © Kluwer 1991 

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