Properties of optical radiation of variables and quasars
Photoelectric observations in the system UBV are considered for 42 variable stars, six quasars and Sco XR-1 with U-B and B-V colors of different type radiations. There are regressive dependences for nearly all the objects. On the Delta V/Delta B, Delta U/Delta B plane the objects were divided according to the types and situated along the bands. The directions of these bands are in agreement with values of A for different types of radiation.