Results of UBVR observation of some Is variable stars.

During the past several years, the authors have been engaged in a program of UBVR photometry of some Is variable stars. Objects which proved to belong to other (nonirregular) known or still unknown types of variability are presented. It is found that SY Cep, TY CrA, IP Per and RZ Psc are close binary eclipsing or probable eclipsing systems. In a similar way, SY Sgr and BO Cep can be eclipsing binaries. From these new data, it is shown also that V379 Cas, CF Per, RS Sge and EH Cep are pulsating variable stars. There are not enough observational data to define the type of variablility of BH Cep, V425 Cyg, LkHα 373, LkHα 374, AS 442, LkHα 127 and BH Lac.