Superhumps in Cataclysmic Binaries. IV. MV Lyrae

David R. Skillman, Joseph Patterson, John R. Thorstensen
1995 Publications of the Astronomical Society of the Pacific  
We report the results of a photometric and spectroscopic campaign on the novalike variable MV Lyrae in a "high state" during 1993 August/September. Radial-velocity observations establish an underlying binary period of 0.1329±0.0004 d, with a remarkably small AT-amplitude of 25±4 km s -1 . The very low AT-values for both stars in the binary attest to a very low binary inclination, in the range 10°-13°. Our photometric data seem to confirm two of the periodic signals reported by Borisov [A&A,
more » ... y Borisov [A&A, 261, 154 (1992)]: quasiperiodic oscillations with a period of 48 min, and a slow wave with a period -3.6 d. On the third signal reported by Borisov, "superhumps" with a period of 0.138 d, our data are less strongly supportive but still tend to favor the existence of the signal. The mass ratio of the binary is 0.43 Í0.13» somewhat higher than usually assumed in theoretical studies of superhumps.
doi:10.1086/133590 fatcat:xsv6tzrxircnphfbf4xuxb6fzy