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Constraints on the Atmospheric Parameters of the Binary DA White Dwarf L870-2 (EG11)

Published online by Cambridge University Press:  12 April 2016

P. Bergeron ,
F. Wesemael ,
J. Liebert ,
G. Fontaine  and
P. Lacombe
P. Bergeron
Affiliation:
Département de Physique, Université de Montréal
F. Wesemael
Affiliation:
Département de Physique, Université de Montréal
J. Liebert
Affiliation:
Steward Observatory, University of Arizona
G. Fontaine
Affiliation:
Département de Physique, Université de Montréal
P. Lacombe
Affiliation:
Département de Physique, Université de Montréal

Extract

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The recent discovery that the cool DA white dwarf L870-2 (EG11, WD0135-052) is a double-lined spectroscopic binary composed of a detached pair of DA white dwarfs (Saffer, Liebert, and Olszewski 1988, SLO hereafter) has raised some challenging problems for stellar evolution theories of such binary systems. One first important step in the understanding of this short-period system is to establish the atmospheric parameters of each component. SLO have argued from previous determinations of the effective temperature and absolute magnitude of the system, and also from their own study of the composite Hα profile, that the two components should be similar. We wish here to reexamine this assertion by taking a new look at the constraints on the two components brought about by the available observational data.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 114: White Dwarfs , 1989 , pp. 435 - 439
Copyright
Copyright © Springer-Verlag 1989

References

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