Dwarf Nova Outbursts. III. The Viscosity Parameter alpha

Details Dwarf Nova Outbursts. III. The Viscosity Parameter alpha Dwarf Nova Outbursts. III. The Viscosity Parameter alpha

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aca....49..391s&link_type=abstract

Acta Astronomica, v.49, pp.391-401, (1999).

Astronomy and Astrophysics

Astronomy

40

Accretion: Accretion Disks, Binaries: Close, Novae: Cataclysmic Variables

Scientific paper

Visual light curves based on dwarf nova models, covering a broad range of relevant parameters, are used to determine the widths of outbursts, rates of decline, and UV delays, as well as their dependence on the orbital period. >From a comparison with the observational data it is found that the value of alpha on the hot branch of the Sigma-T_e relation is alphahot approx 0.2. An important test is also made concerning the tidal radii of disks. A comparison of the absolute visual magnitudes at maximum, obtained from model light curves, with the observed M_V(max) gives Rtid/RRoche approx 0.9, which is the standard value used in model calculations.

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