The Four College Automated Photoelectric Telescope obtained differential Strömgren uvby observations of the magnetic chemically peculiar (mCP) stars HD 20629, HR 3724, 45 Leo, and HD 192678. HD 20629, a moderately large amplitude variable, has a period of 2.9934 days. Analyses of this new photometry with published uvby values show that HR 3724 and 45 Leo had periods of 33.984 and 1.44404 days, respectively, for at least 30 yr. New observations of HD 192678 refine the period of this small‐amplitude variable to 6.4193 days.
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Saul J. Adelman (2006) studied this question.
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