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The first V Rc Ic bands light curves of MQ UMa are presented and analyzedusing the Wilson-Devinney (W-D) program. It is discovered that MQ UMa is anA-subtype contact binary with a high fill-out (f=82 %) and a low mass ratio (q= 0:195), which indicates that it is in the late evolutionary stage of latetypetidal-locked binary stars. The mass of the primary and secondary stars areestimated and the evolutionary status of the two components are placed in theH-R diagram. The W-D solutions also indicates that MQ UMa may be a triplesystem with an F5V type additional component. A sample of sixteen high fillout,low mass ratio overcontact binaries are collected and their possible evolutionscenarios are discussed. Using the five times of light minimum recentlyobserved together with those collected from literatures, the authors find thatthe observedcalculate (O-C) curve exhibits a cyclic period variation. Thecyclic period change also reveals the presence of a tertiary component, whichmay play an important role in the formation and evolution of this binary systemby drawing angular momentum from the central system.

The first photometric analysis of the overcontact binary MQ UMa with an additional component