COMMUNICATIONS / MITTEILUNGEN
U, B, V Photometry of the Multiple Periodic RR Lyrae Star RV Ursae Majoris
No. 69
Budapest, 1976
Abstract
Three-colour photoelectric photometry of the RRab variable star RV Ursae
Majoris is presented. Period and total light curve changes of the star during
the Blazhko period and O-C diagrams of both the main and the secondary
periods are investigated. It was found that a certain phase point (Phi_s = 0.94)
of the ascending branches of the light curves showed no oscillation during
the Blazhko period, which is hardly compatible with the assumption of the
superposition of beat periods. A long cycle of 6-8 years in the O-C
variations of the ascending branch was also found. Similar long cycle
variations are shown by other RR Lyrae stars exhibiting the Blazhko effect,
this variation being reminiscent of the solar magnetic cycle.
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