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Context. Mass loss is an important property in evolution models of massivestars. As up to 90% of the massive stars have a visual or spectroscopiccompanion and many of them exhibit mass exchange, mass-loss rates can beacquired through the period study of massive binaries.  Aims. Using our own photometric observations as well as archival data, welook for variations in orbital periods of seven massive eclipsing binarysystems in the Cygnus OB2 association and estimate their mass-loss rates andstellar parameters.  Methods. We use a Bayesian parameter estimation method to simultaneously fitthe period and period change to all available data and a stellar modelling toolto model the binary parameters from photometric and radial-velocity data.  Results. Four out of the seven selected binaries show non-zero period changevalues at two-sigma confidence level. We also report for the first time theeclipsing nature of a star MT059.

Period change of massive binaries from combined photometric and spectroscopic data in Cygnus OB2