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Two eclipsing binary systems UZ Lyr and BR Cyg are the semi-detached typeswhose secondary component fill its Roche lobe. Although radial velocity andlight curves of these systems have already been investigated separately, bothradial velocity and light curves of them are analyzed simultaneously for thefirst time in the present study . Also, the orbital period changes of thesesystems are studied. Our results show that the mass transfer between componentshave negligible effects on the orbital period changes of these systems, but twolight-time effects are the reasons of the periodic behavior of the O-C curvefor UZ Lyr. We could not remark more information about orbital period changesfor BR Cyg, but we find a new orbital period for it. By radial velocity andlight curves analysis we find a clod spot on the secondary components of BRCyg. The new geometrical and physical parameters of both systems are obtainedand their positions on H-R diagram demonstrated.

Light Curves Analysis and Period Study of Two Eclipsing Binaries UZ Lyr and BR Cyg