Accretion disks in cataclysmic variables - The influence of the frictional parameter alpha on the structure

Details Accretion disks in cataclysmic variables - The influence of the frictional parameter alpha on the structure Accretion disks in cataclysmic variables - The influence of the frictional parameter alpha on the structure

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...128..420m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 128, no. 2, Dec. 1983, p. 420-425.

Astronomy and Astrophysics

Astrophysics

79

Accretion Disks, Binary Stars, Stellar Mass Accretion, Variable Stars, Dwarf Novae, Flux Density, Friction, Stellar Magnetic Fields, Viscosity

Scientific paper

The influence that different assumptions about the frictional parameter alpha have on the structure of accretion disks is investigated, in particular the effect of such assumptions on the viscosity-surface density relation critical for the proposed outburst mechanism. The computer code equations used to determine the vertical structure of the disk are described, and the results of a series of computations of three fixed values of alpha and two mass accretion rates are given. Corresponding results are presented for the case when alpha depends on the nondimensional number H/r where H is the pressure scale height and r the distance from the center. The applicable form of this dependence is deduced from a model of small-scale magnetic field friction. It is shown how the different values of alpha influence the viscosity-surface density relation, and the consequences of these results for the limit cycle instability are discussed.

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