BS Tauri—Evidence for Cyclic Activity in an Orion Irregular

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Lawrence Krumenaker

1890-C Briarcliff Circle, Atlanta, GA 30329

Received April 30, 2009; revised June 9, 2009; accepted June 9, 2009

Abstract
The irregular variable star BS Tauri (type Inbs?) is found to have not only H-α emission and an irregular brightness variation but also an underlying six-year periodicity in brightness. BS Tau should actually be classified as a classical T Tauri star (Int, CTTS), but whether the cyclicity is caused by starspots, a companion, or a circumstellar disk is not certain. Tests to determine the origin of variation are listed.