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Aims. We analyze new multicolor light curves and recently published radialvelocity curves for close binaries QX And, RW Com, MR Del, and BD +07{\circ}3142 to determine the physical parameters of the components. Methods. The lightcurves are analyzed using a binary star model based on Roche geometry to fitthe photometric observations. Spectroscopic parameters, such as the mass ratiosand spectral types, were taken from recent spectroscopic studies of the systemsin question. Results. Our findings provide consistent and reliable sets ofstellar parameters for the four studied binary systems. Of particular interestis the BD +07{\circ} 3142 system, since this is the first analysis of its lightcurves. We find that it is an overcontact binary of W UMa type and W subtype,and that each component has a large cool spot in the polar region. QX And is anA subtype, and RW Com a W subtype W UMa binary, and in both systems we find abright spot in the neck region between the components. MR Del is a detachedbinary with a complex light curve that we could model with two cool spots onthe hotter component.

Physical parameters of close binaries QX Andromedae, RW Comae Berenices, MR Delphini, and BD +07{\circ} 3142