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Paper: Accretion Discs: Limit Cycles and Instabilities
Volume: 160, Astrophysical Discs: An EC Summer School
Page: 33
Authors: Livio, Mario
Abstract: The existing disc instability model for dwarf nova eruptions is reviewed, in the light of recent progress in the understanding of angular momentum transport in accretion discs. It is proposed that the standard lower branch in the ``S-curve'' in the effective temperature-surface density plane may not exist. Rather, angular momentum transport may be suppressed in quiescence as a result of cooling. The model for superoutbursts is also examined, and it is pointed out that recent simulations strongly support the idea of a thermal-tidal instability.
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