UVBY PHOTOMETRY OF THE MAGNETIC CHEMICALLY PECULIAR STARS HD-37776, HR-2258, HR-6958, AND 108-AQUARII

Differential Stromgren uvby photometric observations from the Four Col lege Automated Photoelectric Telescope are presented for four magnetic chemically peculiar stars. Comparison with uvby photometry of Pederse n & Thomsen for HD 37776 yields an improved period of 1.538675 days. N ew periods of 15.0305 days and 18.065 days are found for the sharp-lin ed stars HR 2258 and HR 6958, respectively, rather than one of their a liases. For HR 6958 each color shows a slightly different time of maxi mum. Comparison of the four color photometry of 108 Aqr taken during t he fall of 1995 which well covers the period shows the presence of a s econdary minimum near primary maximum in u, v, and b. Comparison with published photometry indicates indicates that subtle changes in the sh apes of the light curves have occurred suggesting that this star might be precessing.