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The contact eclipsing binary system XX Leonis (P = 0.97 days, sp A8) has beenanalysed using the PHOEBE programme, based on the Wilson Devinney code. TheBVRI light curves were obtained during spring 2006 using the 20-cm telescopeand ST-7 CCD detector. The effective temperature of the primary componentdetermined from the photometric analysis is T=(7889+/-61)K, the inclination ofthe orbit is i=(89.98+/-2.45)deg and the photometric mass ratioq=(0.41+/-0.01). Also the third body hypothesis was suggested, based on theperiod analysis using 57 minimum times and resulting the period of the thirdbody p3= (52.96+/-0.01)yr, amplitude A=(0.057+/-0.029)d and eccentricitye=(0.79+/-0.08) which gives the minimum mass m3,min=(3.6+/-0.8)M_sun.

The BVRI Light Curves And Period Analysis Of The Beta Lyrae System XX Leonis