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The nature of accretion disks of close binary stars: overreflection instability and developed turbulencea Department of Physics, University of California, Santa Barbara, CA, USA b Institute of Astronomy, Russian Academy of Sciences, ul. Pyatnitskaya 48, Moscow, 119017, Russian Federation c Russian Research Centre ‘Kurchatov Institute’, Institute of Physics of Stochastic Structures, pl. Kurchatova 1, Moscow, 123182, Russian Federation The current status of the physics of accretion disks in close binary stars is reviewed, with an emphasis on the hydrodynamic overreflection instability, which is a factor leading to the accretion disk turbulence. The estimated turbulent viscosity coefficients are in good agreement with observations and explain the high angular momentum transfer rate and the measured accretion rate. Based on the observations, a power-law spectrum for the developed turbulence is obtained.
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