One Hundred Years of Observations of the Be Star HDE 245770 (the X-ray   Binary A0535+26/V725 Tau): The End of an Active Phase
  UBV observations of the X-ray binary system A0535+26/V725 Tau at the Crimean Station of the Sternberg Astronomical Institute in 1980-1998 are presented. Based on our and published data, we analyze the photometric history of the star from 1898. 
V.M. Lyuty, G.V. Zaitseva (Sternberg Astronomical Institute, Moscow)