QUASI-PERIODIC OSCILLATIONS IN THE CATACLYSMIC VARIABLE KR-AURIGAE

We present fast photometric observations of KR Aurigae, a nova-like va riable, made during 1984-1988, in the B and U bands. The light curves show large-amplitude pulsations with periods in the range 480-780 s. T he period is found to be different even on consecutive nights and, the refore, these pulsations are interpreted as ''quasi-periodic'' in natu re. The pulsation periods in the bright state are positively correlate d with the source intensity, but the low-state periods do not follow t his linear trend. We discuss possible explanations of the quasi-period ic oscillations. Pulsations with period in the 1050-1600 s range are a lso found in the data, which can be attributed to broader features see n in the light curves. We also present the X-ray results from analysis of the observations made with the Einstein Observatory. The X-ray spe ctrum is found to be soft with a large hydrogen column density.