Is the accretion disc of TT Ari hotter after a minimum ?
Pringle, J. E.; Tout, C. A.; La Dous, C.
Abstract
Ultraviolet spectra of nova-like variables appear to be cooler than those of dwarf novae in outburst. This suggests that, once a steady-state accretion disc becomes established, it releases less of its energy thermally and more in other forms such as mass loss or magnetic flux. Here we use archival lUE data for the anti-dwarf nova TT Ari to show that its spectrum also is cooler at the end of a period in a high state than it is just after a minimum. Models such as that proposed by Tout & Pringle for magnetic viscosity in the disc could account for this kind of behaviour.