UBVr sequences and observations of optically identified radio sources

Photoelectric observations of eight optically identified radio sources and comparison stars in nearby fields are presented. Six of these objects have continuous spectra and may belong to the BL Lac class of variables. The reported observations indicate possible short-term, small-amplitude variations in some of the optical counterparts of the radio sources. (9 figures, 3 tables, 14 references) (U.S.)