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The Rise and Fall of α-Model Viscosity

Published online by Cambridge University Press:  12 April 2016

F. V. Hessman  and
C. Obach
F. V. Hessman
Affiliation:
Universitäts-Sternwarte Göttingen, Germany
C. Obach
Affiliation:
Universitäts-Sternwarte Göttingen, Germany

Abstract

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For nearly two decades, our only useful model for the viscosity in accretion disks has been the so-called ‘α-model’. However, it has become clear that the simplest models –in which α is constant – are inadequate to explain the range of behaviours seen in real disks. We show that the properties of steady-state, vertically-averaged models can be determined without any assumptions other than that the disks obey the classical Navier-Stokes equation. These solutions have derived values of α which vary with radius by many orders of magnitude even in small CV disks.

Type
Accretion Discs
Information
International Astronomical Union Colloquium , Volume 158: Cataclysmic Variables and Related Objects , 1996 , pp. 111 - 114
Copyright
Copyright © Kluwer 1996

References

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