DETECTION OF PERIODS FOR T-TAURI STARS

We present the results of UBrH(alpha)z monitoring of a sample of T Tau ri stars. The method of differential CCD photometry was applied. The o bservations span a range of ten days and show that eleven out of twelv e sources Varied during this time interval. These variations are corre lated in all bands. Periods were detected (confidence level 99.99%) fo r eight out of eleven variable stars; one additional period was found at the 99.9% confidence level. Of those, one (BP Tau) agrees with prev iously published periods; two, GM Aur and IQ Tau, do not; six are new detections of periodicities. The sample is drawn from the Taurus-Aurig a and Cepheus IV star-forming regions.