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Does the Cataclysmic Binary Z Cha Contain a Black Dwarf Secondary?

Published online by Cambridge University Press:  12 April 2016

John Faulkner  and
Hans Ritter
John Faulkner
Affiliation:
Lick Observatory, Board of Studies in Astronomy and Astrophysics, University of California, Santa Cruz
Hans Ritter
Affiliation:
Max-Planck-Institut für Physik und Astrophysik, Garching

Abstract

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It is shown that the assumption of a black dwarf secondary in Z Cha leads to a number of contradictions with well established theoretical and observational facts. In particular the model predicts the radial velocity K1 to be much smaller than is observed, the radius of the accretion disk to be smaller than is physically possible and a white dwarf mass which is inconsistent with the white dwarf's radius derived from eclipse analysis. Using the same arguments as for Z Cha it is also possible to exclude a black dwarf secondary in the similar systems OY Car and HT Cas.

Type
Part IV: Cataclysmic Binaries and their Role in Stellar Evolution
Information
International Astronomical Union Colloquium , Volume 69: Binary and Multiple Stars as Tracers of Stellar Evolution , 1982 , pp. 483 - 488
Copyright
Copyright © Reidel 1982

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