IS THE ACCRETION DISC OF TT ARI HOTTER AFTER A MINIMUM

Ultraviolet spectra of nova-like variables appear to be cooler than th ose of dwarf novae in outburst. This suggests that, once a steady-stat e accretion disc becomes established, it releases less of its energy t hermally and more in other forms such as mass loss or magnetic flux. H ere we use archival IUE data for the anti-dwarf nova TT Ari to show th at 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 ki nd of behaviour.