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The subtype of hot algol semidetached binaries dubbed Double PeriodicVariables (DPVs) are characterized by a photometric cycle longer than theorbital one, whose nature has been related to a magnetic dynamo in the donorcomponent controlling the mass transfer rate. We aim to understand themorphologic changes observed in the light curve of OGLE-BLG-ECL-157529 that arelinked to the long cycle. In particular, we want to explain the changes inrelative depth of primary and secondary eclipses. We analyze $I$ and $V$-bandOGLE photometric times series spanning 18.5 years and model the orbital lightcurve. We find that OGLE-BLG-ECL-157529 is a new eclipsing Galactic DPV oforbital period 24\fd8, and that its long cycle length decreases in amplitudeand length during the time baseline. We show that the changes of the orbitallight curve can be reproduced considering an accretion disk of variablethickness and radius, surrounding the hottest stellar component. Our modelsindicate changes in the temperatures of hot spot and bright spot during thelong cycle, and also in the position of the bright spot. This, along with thechanges in disk radius might indicate a variable mass transfer in this system.

Long photometric cycle and disk evolution in the $\beta$ Lyrae type binary OGLE-BLG-ECL-157529