Journal
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
Volume 67, Issue 3, Pages -Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pasj/psv023
Keywords
accretion, accretion disks; magnetic fields; stars: dwarf novae; stars: individual (WZ Sge, EG Cnc, V585 Lyr, V1504 Cyg)
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SU UMa stars after their long superoutbursts often show single or multiple rebrightenings. We show how this phenomenon can be understood as repeated reflections of transition waves which mediate changes between the hot and the cool state of the accretion disk and travel back and forth in the outer disk region, leaving an inner part permanently hot. This points to a temporarily increased viscosity, possibly related to the formation of large-scale and longer persisting magnetic fields by the dynamo operation during the long superoutburst. The mini-rebrightenings in the early post-outburst light curve of V585 Lyr discovered by Kato and Osaki (2013, PASJ, 65, 97) in Kepler observations seem to be understandable as a small limit cycle of low-luminosity changes originating from a wiggle feature in the thermal equilibrium curve of the cool, optically thick disk.
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