Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...419..780r&link_type=abstract
Astrophysical Journal v.419, p.780
Astronomy and Astrophysics
Astronomy
3
Accretion, Accretion Disks -- Hydrodynamics -- Stars: Individual (T Coronae Borealis)
Scientific paper
We continue the investigation of Cannizzo & Kenyon into the model proposed by Webbink to account for the eruptive behavior of the recurrent nova T CrB which occurred in 1946. In particular, we present threedimensional hydrodynamical computations of the blob of material which is ejected from the mass-losing star in the Webbink model and find that, within several dynamical time scales, the blob should become smeared out by tidal forces and internal gas pressure into a disk-shaped body with roughly constant surface density (as projected onto the orbital plane). We then reexamine the spreading torus model employed by Cannizzo & Kenyon to account for the observed secondary maximum in the 1946 outburst using a one-dimensional accretion disk model within the context of the three-dimensional hydrodynamical results. The model presented by Cannizzo & Kenyon of an exponentially increasing viscosity parameter α(t) for the accretion disk is still viable, but the accretion disk flux during early times is much greater than before. In addition, during the time before peak accretion disk luminosity there are two outward-moving transition fronts one associated with the transition between the low- and high-α regions of the disk, and a second associated with the interface between ionized and neutral disk material. These are roughly coincident with each other and are caused by the outward wave of increasing accretion disk viscosity which comes about when one takes a local growth rate for α dependent on the Keplerian frequency. We are able to reproduce the secondary maximum fairly well using 10- and 3 for initial and final values of α, and a local growth timescale for α of 2/Ω.
Cannizzo John Kendall
Kenyon Scott. J.
Ruffert Maximilian
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