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A Model for WZ Sge with “Standard” Values of α

Published online by Cambridge University Press:  12 April 2016

J.M. Hameury ,
J.M. Huré  and
J.P. Lasota
J.M. Hameury
Affiliation:
URA 2180 du CNRS, Observatoire de Strasbourg, 11 rue de I’Université, F–67000 Strasbourg, France
J.M. Huré
Affiliation:
URA 173 du CNRS, DAEC, Observatoire de Paris, Section de Meudon, F–92195 Meudon Cedex, France
J.P. Lasota
Affiliation:
UPR 176 du CNRS, DARC, Observatoire de Paris, Section de Meudon, F–92195 Meudon Cedex, France

Abstract

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We present a model for the dwarf nova WZ Sge which does not imply an unusually – and unexplained – low value of the viscosity during low states. We propose that the inner parts of the accretion disc are disrupted by either a magnetic field or evaporation, so that the disc is stable (or very close to being stable) in quiescence, as the mass transfer rate is very low, and the disc can sit on the cool, lower branch of the thermal equilibrium curve. Outbursts are triggered by an increase of mass transfer, causing a standard disc instability, and are strongly enhanced by illumination effects. Both the recurrence time, and the characteristics of the light curve in outburst can be accounted for.

Type
Part 7. Local and Global Instabilities and Disk Perturbations
Information
International Astronomical Union Colloquium , Volume 163: Accretion Phenomena and Related Outflows , 1997 , pp. 279 - 282
Copyright
Copyright © Astronomical Society of the Pacific 1997

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