OBSERVATIONS OF TYPICAL, RARE AND UNIQUE PHENOMENA IN CLOSE BINARIES WITH EXTREMAL MASS RATIO

Abstract

We present the review of different properties of several close binary systems, based on our observations. These binaries are as follow: SU UMa type stars V503 Cyg and V1504 Cyg, X-Ray novae V518 Per and V404 Cyg. They have the extremal mass ratio of the primary component to the secondary M1/M2 > 3. Some of them show the typical for the SU UMa type stars behaviour, so-called the "positive superhumps" or more rare "negative superhumps". Another display the "forbidden" variability in the ordinary outbursts or the light variation of unknown yet nature.