Astron. Astrophys. Suppl. Ser. 134, 263-270

MV Lyrae: Photometric study at high state

Z. Kraicheva - V. Stanishev - V. Genkov

Send offprint request: Z. Kraicheva

Institute of Astronomy, Bulgarian Academy of Sciences, 72 Tsarigradsko Shosse Blvd., BG-1784 Sofia, Bulgaria
e-mail: zk@astro.bas.bg

Received March 6, 1997; accepted August 12, 1998

Abstract:

Photoelectric observations of novalike MV Lyr in a standard UBV system were carried out at Rozhen and Belogradchik observatories in 1992 and 1993. During all the nights of observations the star was in high state ($V\sim$ 12.5 mag). The observing runs performed in U and B bands show strong flickering activity and a typical shape of the red noise power spectrum. The periodogram analysis of time series shows quasi-periodic oscillations with a period of about 50 min. The excitation of trapped oscillations at the outer edge of the accretion disc, has been proposed as a possible mechanism for generation of MV Lyr quasi-periodic oscillations. The properties of the flickering in MV Lyr light curves were determined.

Key words: accretion, accretion disks -- stars: MV Lyr -- stars: novae, cataclysmic variables -- X-ray: stars