Detection of periods for T Tauri stars^*

¹ MPG Research Unit “Staub in Sternentstehungsgebieten”, Schillergäßchen 2-3, 07745 Jena, Germany. e-mail: osterloh@sol.astro.uni-jena.de
² MPIA Heidelberg, Königstuhl 17, 69117 Heidelberg, Germany

Send offprint request to: M. Osterloh

Received: 11 August 1995
Accepted: 23 March 1996

Abstract

We present the results of monitoring of a sample of T Tauri stars. The method of differential CCD photometry was applied. The observations span a range of ten days and show that eleven out of twelve sources varied during this time interval. These variations are correlated in all bands. Periods were detected (confidence level 99.99%) for eight out of eleven variable stars; one additional period was found at the 99.9% confidence level. Of those, one (BP Tau) agrees with previously published periods; two, GM Aur and IQ Tau, do not; six are new detections of periodicities. The sample is drawn from the Taurus-Auriga and Cepheus IV star-forming regions.