Photometric monitoring of dwarf novae

BVRC IC photometric observations of a large sample of dwarf novae were obtained since 1993. In this brief paper we resume the significant variations in the colour indices during the outburst–cycle, and the main results of our monitoring. The main conclusion is that we have yet a poor knowledge of the true radiative transfer solution in accretion disk, and more efforts must be made to obtain multi-wavelength observations.