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We report results of the eclipse mapping analysis of an ensemble of lightcurves of HT Cas. The fast response of the white dwarf to the increase in masstransfer rate, the expansion rate of the accretion disc at the same time, andthe relative amplitude of the high-frequency flickering indicate that thequiescent disc of HT Has has high viscosity, alpha ~ 0.3-0.7. This is in markeddisagreement with the disc-instability model and implies that the outbursts ofHT Cas are caused by bursts of enhanced mass-transfer rate from its donor star.

Eclipse mapping the flickering sources in the dwarf nova HT Cassiopeia