Transition waves in accretion disks

Details Transition waves in accretion disks Transition waves in accretion disks

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...131..303m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 131, no. 2, Feb. 1984, p. 303-308.

Astronomy and Astrophysics

Astrophysics

66

Accretion Disks, Bursts, Dwarf Novae, Stellar Radiation, Flare Stars, Stellar Models, Transient Response, Variable Stars, Viscous Flow

Scientific paper

Transition waves that occur in accretion disks with bi-stable viscosity-surface density relations are discussed. They separate regions of hot and cold state and move with velocities of the order of the sound velocity times the frictional parameter alpha. Two types exist, a transition from the cold to the hot state and the inverse transition, the former moving characteristically faster than the latter. At boundaries of bi-stable regions one type of wave is reflected as the other type. From the role of transition waves in dwarf novae outbursts a requirement for a minimum ratio in friction between hot and cold state is derived. This requirement cannot be fulfilled for constant alpha disks but could be for disks with a scale height dependent alpha. Using such a model computations of transition wave velocities as function of radial distance r and surface density sigma are performed in the approximation of a localized front. Results are discussed in relation to models for dwarf novae outbursts.

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