STROMGREN UVBY-PHOTOMETRY OF THE MAGNETIC CHEMICALLY PECULIAR STARS HD-32633, 25-SEXTANTIS, HR-7224, AND HD-200311

Differential Stromgren uvby photometric observations from the Four Col lege Automated Photoelectric Telescope refine the rotational periods a nd define the shapes of the light curves of four magnetic Chemically P eculiar stars. HD 32633 (P = 6.43000 d) exhibits an in-phase variabili ty with asymmetrically shaped light curves. 25 Sex (P = 4.37900 d) has a complex variability with the v, b, and y light variability crudely in phase, but quite different from that of u. HR 7224 (P = 1.123095 d) shows in-phase variability with two nearly equal secondary minima. HD 200311 (P = 26.0042 d), which was previous thought to be a long perio d variable, is found to be a modest photometric variable.