RZ Cassiopeia: an Eclipsing Binary with a Pulsating Component

We report time-resolved V- and R-band CCD photometry of the eclipsing binary RZ Cas obtained with 38-cm Cassegrain telescope at the Crimean Astrophysical Observatory during July 2004 - October 2005. The obtained lightcurves clearly demonstrates rapid pulsations with a period of about 22 min. A periodogram analysis of these oscillations is also reported. On 12 January, 2005 (JD 2453383) we observed rapid variability with higher amplitude (0m.1), that perhaps may be interpreted as a high-mass-transfer-rate event and inhomogeneity of the accretion stream. Follow-up observations (both photometric and spectroscopic) of RZ Cas are strictly desirable for more detailed study of such events.