Other
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984phdt.........7c&link_type=abstract
Ph.D. Thesis Texas Univ., Austin.
Other
6
Accretion Disks, Bursts, Cataclysmic Variables, Stellar Activity, Time Dependence, Vertical Distribution, Convection, Hydrogen Recombinations, Hysteresis, Parameter Identification, Scaling Laws, Thermal Instability
Scientific paper
A parameter study of the vertically explicit structure corresponding to steady state, alpha model, thin disk accretion for accreting objects of 1 solar mass was conducted and particular attention paid to the role of convection in the vertical structure and to the location of critical points which represent the onset of thermal instability. Results show that there are at least two distinct physical effects which can give rise to hysteresis behavior. One effect is predominant for large alpha and the other for small alpha. Optically thin conditions are also examined. Scaling laws are presented for the fundamental properties of the vertically explicit models and these are used to derive time scales for various idealized phenomena. An ordering of three disk time scales is presented. Instability associated with hydrogen recombination, convection, or both is compared, with the instability associated with the onset of convection. To understand the effect the vertical structure disk physics has on the burst cycles, scalings obtained from the steady state parameter study were incorporated into a generalized time dependent nonthermal equilibrium model. A comparison between light curves obtained from this model and observed light curves enables restrictions to be placed on the viscosity parameter, the secondary mass transfer rate, and the treatment of the inner boundary.
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