The evolution of viscous discs. II - Viscous variations

Details The evolution of viscous discs. II - Viscous variations The evolution of viscous discs. II - Viscous variations

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.199..267b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 199, Apr. 1982, p. 267-280.

Astronomy and Astrophysics

Astronomy

92

Dwarf Novae, Light Curve, Mass Transfer, Stellar Evolution, Stellar Mass Accretion, Stellar Models, Binary Stars, Stellar Luminosity, Stellar Temperature, Time Dependence, Viscous Flow

Scientific paper

The necessary conditions for mass flow through an accretion disc to be modulated by viscous variations are examined. It is shown that outburst behaviour is possible if the disc undergoes a global limit-cycle in which the viscosity is a two-valued function of disc structure. An attempt is made to model the eruptions of dwarf nova discs as a limit-cycle. The resulting light curves exhibit discontinuous changes in luminosity. If the viscosity is imposed, by some external agency, as a function of time, then improved light curves are obtained. Nonetheless, it is not possible to obtain the whole range of dwarf nova light curves, and those which are fitted require a restricted range

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