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Instabilities in Accretion Disks of Cataclysmic Variables: A Unification Model for Dwarf Nova Outburst

Published online by Cambridge University Press:  12 April 2016

Yoji Osaki
Yoji Osaki*
Affiliation:
Department of Astronomy, University of Tokyo, Bunkyo-ku, Tokyo113

Abstract

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Instabilities of accretion disks in cataclysmic variable stars are reviewed in relation to dwarf nova outbursts. Two different kinds of instabilities of accretion disks are now known: the thermal instability and the tidal instability. The thermal instability is produced by hydrogen ionization-recombination transition, which gives rises to a thermal limit-cycle oscillation in accretion disks and it is thought to be responsible for outbursts of U Gem-type dwarf novae. The tidal instability is produced by the tidal effects of the secondary star on accretion disks, by which the disk is deformed to eccentric form and it slowly precesses in the inertial frame of reference. The tidal instability is thought to be responsible for the superhump phenomenon observed during superoutbursts of SU UMa-type dwarf novae. There is a rich variety in outburst behaviors of non-magnetic cataclysmic variables, starting from non-outbursting nova-like stars to various sub-classes of dwarf novae. A unification model for dwarf nova outbursts is then proposed based on these two instabilities. In this model, the non-magnetic cataclysmic variables are classified in the orbital-period versus mass-transfer-rate diagram into four regions depending on different combination to these two instabilities, and their observed outburst behaviors are basically understood on this diagram.

Type
Part 7. Local and Global Instabilities and Disk Perturbations
Information
International Astronomical Union Colloquium , Volume 163: Accretion Phenomena and Related Outflows , 1997 , pp. 269 - 278
Copyright
Copyright © Astronomical Society of the Pacific 1997

References

Bath, G.T. 1973, Nature Phys. Sci., 246, 84 Google Scholar
Cannizzo, J.K. 1993, in Accretion Disks in Compact Stellar Systems, Wheeler, J.C., Singapore: World Scientific Publishing, 6 Google Scholar
Hirose, M., & Osaki, Y. 1990, PASJ, 42, 135 Google Scholar
Howell, S.B., Szkody, P., & Cannizzo, J.K. 1995, ApJ, 439, 337 Google Scholar
Kolb, U. 1993, A&A, 271, 149 Google Scholar
Lubow, S.H. 1991, ApJ, 381, 259 Google Scholar
Murray, J.R. 1996, MNRAS, 279, 402 Google Scholar
Osaki, Y. 1974, PASJ, 26, 429 Google Scholar
Osaki, Y. 1989, PASJ, 41, 1005 Google Scholar
Osaki, Y. 1994, in Theory of Accretion Disks-2, Duschl, W., et al., Dordrecht: Kluwer Academic Publishers, 93 Google Scholar
Osaki, Y. 1995a, PASJ, 47, 47 Google Scholar
Osaki, Y. 1995b, PASJ, 47, L11 Google Scholar
Osaki, Y. 1995c, PASJ, 47, L25 Google Scholar
Osaki, Y. 1995d, in Cataclysmic Variables, Bianchini, A., Della Valle, M., & Orio, M., Dordrecht: Kluwer Academic Publishers, 307 Google Scholar
Osaki, Y. 1996, PASP, 108, 39 Google Scholar
Robinson, E.L., Wood, J.H., Bless, R C., Clemens, J.C., Dollan, J.F., Elliot, J.L., Nelson, M.J., Percival, J.W., Taylor, M.J., van Citters, G.W., & Zhang, E., 1995, ApJ, 443, 295 Google Scholar
Skillman, D.R., & Patterson, J. 1993, ApJ, 417, 298 Google Scholar
Smak, J. 1983, ApJ, 272, 234 CrossRefGoogle Scholar
Smak, J. 1993, Acta Astron., 43, 101 Google Scholar
Vogt, N. 1993, in 2nd Technion-Haifa Conference on Cataclysmic Variables and Related Physics, Regev, O. & Shaviv, G., Jerusalem: The Israel Physical Society, 63 Google Scholar
Warner, B. 1995a, Cataclysmic Variable Stars, Cambridge: Cambridge University Press Google Scholar
Warner, B. 1995b, Ap&SS, 226, 187 Google Scholar
Whitehurst, R. 1988, MNRAS, 232, 35 Google Scholar
Whitehurst, R. & King, A. 1991, MNRAS, 249, 25 Google Scholar