A DETACHED BINARY-SYSTEM V505 PERSEI

The UBV photometry of a detached F-type eclipsing binary V505 Persei i s presented. The light curve solution by a simple spherical model comb ined with the radial velocity data from two high resolution spectra by Marschall et al. (1990) reveals that the system is formed with two id entical component stars of M approximate to 1.2M(-) in the main sequen ce close to ZAMS in evolution. They should have about solar metallicit y (z approximate to 0.017). The isochrones with solar metallicity by V an denBerg (1985) yield an age of about (2.2 +/- 0.5) x 10(9) yr for t he system. The distance of the system should be about 60 pc.