CBA Center for Backyard Astrophysics

Superhumps in Cataclysmic Binaries. VII. CY Ursae Majoris

David Harvey and Joseph Patterson

Publications of the Astronomical Society of the Pacific

November 1995, Volume 107, Page 1055

We report photometry of the dwarf nova CY Ursae Majoris during its 1995 superoutburst. A large-amplitude "superhump" at P = 0.07210 ± 0.00003 d was observed; the period decreased with P = -6 × 10-5 over the 12 days of observation. The properties of the superhump appeared normal for SU UMa stars. But the frequencies of high harmonics were slightly blue-shifted from exact integer multiples of the fundamental, an effect which is unexplained but may require invoking differential precession of the accretion disk.



Copyright © 1995 Astronomical Society of the Pacific.