Disk-Instability Model for Outbursts of Dwarf Novae : Time-Dependent Formulation and One-Zone Model
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- Shin Mineshige
- Department of Astronomy, Faculty of Science, University of Tokyo , Bunkyo-ku, Tokyo 113
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- Yoji Osaki
- Department of Astronomy, Faculty of Science, University of Tokyo , Bunkyo-ku, Tokyo 113
書誌事項
- 公開日
- 1983-11-15
- 権利情報
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- https://academic.oup.com/pages/standard-publication-reuse-rights
- DOI
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- 10.1093/pasj/35.3.377
- 公開者
- Oxford University Press (OUP)
説明
<jats:title>Abstract</jats:title> <jats:p>We investigate an accretion-disk-instability model for outbursts of dwarf novae. A numerical scheme is presented to treat the time evolution of unstable accretion disks. Vertical structures of convective accretion disks are integrated to provide necessary relations to solve the time evolution in the radial structure. Then the steady-state solutions and their stability are examined for the standard a-disk. There exist two locally unstable regions where the cooling rate of the disk is less sensitive to temperature than the heating rate. Time evolution of accretion disks resulting from this thermal instability is examined by using a one-zone model in which the outer parts of accretion disks are approximated as one-zone of a torus. Relaxation oscillations are obtained with outburst amplitudes comparable with those found in dwarf novae. The light curves of the one-zone model are found to be very sensitive to the detailed shape of the thermal equilibrium curve in the surface density and the effective temperature (Σ, Teff) diagram, and also to a possible variation in the viscosity parameter α.</jats:p>
収録刊行物
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- Publications of the Astronomical Society of Japan
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Publications of the Astronomical Society of Japan 35 (3), 377-396, 1983-11-15
Oxford University Press (OUP)
