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We present multi-color CCD photometry of the neglected contact binary XZ Leo.Completely covered VRI band light curves and four times of minimum light wereobtained. Combining the photometric and previously published radial velocitydata, a revised photometric analysis was carried out for the binary system byapplying the Wilson-Devinney code. With a hot spot placed on the massiveprimary component near the neck region of the common envelope, the light curveswere satisfactorily modeled. The photometric solution combined with the radialvelocity solution reveals that XZ Leo is an A-type contact binary with a degreeof contact of 24($\pm1)\%$. The absolute parameters of the components weredetermined as M_1 = 1.74($\pm$0.06)M_\odot, M_2 = 0.61($\pm$0.02)M_\odot, R_1 =1.69($\pm$0.01)R_\odot, R_2 = 1.07($\pm0.01$)R_\odot, L_1 = 6.73($\pm0.08$)L_\odot, L_2 = 2.40($\pm$0.04)L_\odot. Based on all the available data, thelong-term orbital period behavior of the system was investigated. It indicatesthat the binary system was undergoing continuous orbital period increase in thepast three decades with a rate of dP/dt = + 6.12 \times {10^{-8}} days yr^{-1},which suggests a probable mass transfer from the secondary to the primarycomponent at a rate of dM/dt= 3.92\times 10^{-8} M_\odot yr^{-1}. The binarysystem is expected to evolve into the broken-contact stage in $1.56 \times10^6$ years. This could be evidence supporting the Thermal RelaxationOscillation theory.

Photometric study and period analysis of the contact binary XZ Leonis