KR Persei, a Mid-F Eclipsing Binary with a One-day Period

KR Per is a partially eclipsing binary with an orbital period of 0.9960798.days, very close to one sidereal day, making it difficult to obtain extensive phase coverage in a reasonable amount of time. We used the WilsonDevinney program to determine its orbital elements and stellar absolute dimensions from recently acquired radial velocities and differential BVRI observations that were supplemented with previous differential UBV measurements and published times of minima. The two components are each F5.V stars with masses of 1.466. 0.015 M. and.1.458. 0.015 M. The radii are.1.855. 0.021 R and.1.824. 0.022 R. The orbital period of the eclipsing system is variable and more times of minima observations are needed. A comparison with evolutionary tracks indicates that the system has an age of 2.1.+/-.0.1 Gyr.