UVBY PHOTOMETRY OF THE CHEMICALLY PECULIAR STARS AR-AURIGAE, 3-HYDRAE, 49-CANCRI, AND BX-BOOTIS

Differential Stromgren uvby photometric observations from the Four Col lege Automated Photoelectric Telescope are presented for four Chemical ly Peculiar stars of the upper main sequence: the HgMn star binary AR Aurigae and the magnetic stars 3 Hydrae, 49 Cancri, and EX Bootis. AR Aurigae shows little variability except during the primary and seconda ry eclipses. The 11.305 day period of Maitzen et al. for 3 Hya is conf irmed. A new period of 7.0501 days is found for 49 Cancri while a slig htly refined period of 2.88756 days is derived for EX Boo.