Other
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apjs...52..451c&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 52, Aug. 1983, p. 451-463.
Other
13
Stellar Mass Accretion, Stellar Oscillations, Viscosity, Accretion Disks, Cubic Equations, Nonadiabatic Conditions
Scientific paper
A general method for calclating the effects of viscosity and nonadiabaticity on small oscillations is presented. Both effects are assumed 'small,' but the system in which the oscillations are occurring may have any geometry whatsoever. The method is conceptually straightforward, but complicated to apply. It is applied to spherically symmetric, purely radial motion in a spherical star; also to a 'classical' steady-state accretion disk that is isothermal in the vertical direction and that has vertical oscillations. Comparison is then made with observed dwarf novae quasi-periodic oscillations, assuming them to be disk oscillations. The observed decay time scales of these oscillations may then be used in conjunction with the derived damping constant to estimate the viscosity present in the accretion disk. The derived viscosities needed to give the observed damping are of the order of eddy viscosities; in other words, the alpha parameter of Shakura and Sunyaev is of order unity.
Cox John P.
Everson B. L.
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