Computer Science
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985esasp.236...83m&link_type=abstract
In ESA Recent Results on Cataclysmic Variables p 83-89 (SEE N86-20287 10-93)
Computer Science
9
Accretion Disks, Cataclysmic Variables, Dwarf Novae, Stellar Activity, X Ray Sources, Stellar Models, Time Dependence, Transition Points
Scientific paper
The accretion disk outburst theory based on unstable stationary mass accretion in regions of partial ionization and convection is discussed. Observations of dwarf novae yield support when compared to time dependent model calculations. Apparent contradictions are rather constraints on unknown free parameters in the theoretical models. Observed features of dwarf novae outbursts indicate that alpha should be lower in cold than in hot regions. For reliable theoretical results the structure of transition fronts should be resolved. Quantitative theoretical progress is limited by the unknown frictional process; the difficulty to reliably model the thermally nonrelaxed transition between cold and hot states in presence of a large radial gradient; by imperfect treatment of disk atmospheres and optically thin regions; and by imperfect knowledge of opacities for very cool gas. It is shown that self-irradiations in accretion disks around neutron stars suppress the thermal instability but can lead to nonlinear mass flow variations on the long diffusive timescale, relevant for low mass X-ray binaries.
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