THE NEW OBSERVATIONS OF SS CYGNI - THE DETECTION OF TOTAL ECLIPSES

The new UBV photoelectric observations of the well-known dwarf nova SS Cyg in quiescence have been carried out. The analysis of our whole sa mple (1982-1991) has permitted to determine a photometrical period 0,2 751302+/-0,d0000004, which coincides with the orbital one. Narrow ecli pse minima with DELTAV = 0,m05, DELTAB = 0,m07 and DELTAU = 0,m09 have been found al the phase 0,54 on the light curve of SS Cyg at the mome ntum of the white dwarf conjunction (when the red dwarf is closer to o bserver). These minima can be attributed to the eclipse of the hot spo t, arising at the place where the matter, flowing from the secondary c omponent, meets the accretion disc. This minimum at phi = 0,54 is abse nt on the light curve in the middle of quiescence and arises before th e outburst and just after the latter. This fact definitely shows the i ncreasing disc dimensions before the outburst - the hot spot is moving towards the star, giving rise to the conditions for the total eclipse . Orbital inclination cannot be less than 50-degrees : 50-degrees < i < 90-degrees.