On the mechanism of angular momentum transport in accretion disks

Details On the mechanism of angular momentum transport in accretion disks On the mechanism of angular momentum transport in accretion disks

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252..189l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 1, Dec. 1991, p. 189-192. Research supported by VPR Research Fund and

Physics

22

Accretion Disks, Dwarf Novae, Stellar Physics, Angular Momentum, Cataclysmic Variables, Momentum Transfer, Shock Waves

Scientific paper

Recently, a new mechanism for angular momentum transport in accretion disks has been proposed. The mechanism is based on tidally induced perturbations which develop into coherent spiral shocks. Angular momentum transfer by the spiral shocks was shown to be quite effective for hot, two-dimensional disks. Observational data on the mean recurrence time-scale of dwarf nova eruptions are used in conjunction with the disk instability model, to obtain a relation between the viscosity parameter alpha and the mass ratio of the system. This relation can be compared to the effective 'viscosity' obtained from the spiral-shocks scheme. The data show a weaker dependence on the mass ratio than predicted. Possible causes for the discrepancy are discussed.

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