A photometric study of 2A 526-328.

UBV and fast photometry of the X-ray source 2A 0526-328 optical counterpart confirms a cataclysmic-variable nature. The light curve shows a periodic hump approximately 0.27-mag full amplitude in B and V at P = 5.18 h, average brightness variations of 0.33 mag on a time scale of 2 d and approximately 0.1-mag flickering on a time scale of some minutes. The hump is thought to derive from a bright spot on an accretion disk; fast color behavior gives evidence for both disk and hot-spot emissivity. A pronounced hump phase shift depending on the system's average luminosity is explained by the hot spot motion on a disk changing size with accretion rate.