uvby photometry of 33 Tauri, HD 50169, and HR 7786 and an assessment of FCAPT comparison stars

Differential Stromgren uvby photometric observations from the Four College Automated Photoelectric Telescope are presented for the ellipsoidal variabl e 33 Tauri, and the magnetic Chemically Peculiar stars HD 50169 and KR 7786 . We confirm that Hube's period of 2.975272 days for 33 Tau is correct. HD 50169 is a constant MCP star. HR 7786 is a large amplitude class member con firming Winzer's discovery, but its period is 8.5297 days. Its comparison s tar, HR 7721. a spectroscopic binary B7 V star, is variable with an amplitu de of order 0.1 mag, but of indeterminant period. In addition Hipparcos pho tometry of the comparison and check stars for early type stars whose photom etry is being obtained with the FCAPT is reviewed to ascertain the stabilit y of these stars.