Monitoring of X-Ray Sources in the Optical Spectral Region
(a) Photometric history of the microquasar CI Cam according to the Bamberg photographic observations in the blue band (similar to the band) (1928–1939). Points are connected by a line in the densely covered segments. Typical uncertainty is 0.05 mag. (b) The activity in the passband in 1989–2004. The peak of the 1998 outburst is out of the scale. Adapted from [58, 60].