FCAPT uvby Photometry of the mCP Stars HD 16545, HD 93226, HR 7575, and HR 8206

Abstract

The Four College Automated Photoelectric Telescope (FCAPT) obtained differential Strömgren uvby observations of the magnetic CP (mCP) stars HD 16545, HD 93226, HR 7575, and HR 8206. These are the first reported from the FCAPT. HD 16545, with its largest amplitudes (0.06 mag) being those in v and in b, has a period of 1.61926 days, close to its period from Hipparcos photometry. The HD 93226 photometry exhibits a period of 1.72907 days, with the v, b, and y light curves in phase. The u light curve is shifted by 0.05 to 0.10 in phase. Its u amplitude is a relatively large 0.10 mag. The v photometry of HR 7575 is consistent with the 223.826 day period of Mikulasek et al. HR 8206 is a small-amplitude variable with a period of 1.5849 days.