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New photoelectric seven-color observations in the Vilnius system arepresented for 65 stars in the region of the open cluster NGC 752. Based onindividual stars with accurate photometric classifications, we determine theapparent distance modulus (m-M)=8.38 and the mean reddening to the clusterE(Y-V)=0.027, or E(B-V)=0.034. The mean photometric metallicity for themain-sequence stars, [Fe/H]=-0.14, is found to be slightly lower than thatderived for the red clump giants, [Fe/H]=-0.08. This difference suggests thatred giants in later evolutionary phases may not have zero-age surface values of[Fe/H]. We made use of the least-squares minimization techniques to fit thePadova theoretical isochrones to the CMD, when the binary star population istaken into account. By varying the distance modulus, metallicity and age, thebest match has been found between the seven magnitudes and colors of theobserved stars and those of model binaries, which gives the distance modulus by0.2 mag smaller than that derived from individual stars, i.e., (m-M)=8.18, aclosely similar metallicity ([Fe/H]=-0.12), and age of 1.6 Gyr. With theseresults, the fraction of photometric binaries among the main-sequence stars is~40%.

Seven-color Vilnius photometry of the open cluster NGC 752