Asiago eclipsing binaries program. II. V570 Per

Abstract

The orbit and physical parameters of the double-lined eclipsing binary V570 Per, discovered by the Hipparcos satellite, are derived with formal errors better than 1% using high resolution Echelle spectroscopy and B, V photoelectric photometry. Atmospheric analysis is performed on spectra at quadrature using synthetic spectroscopy that indicates a [Fe/H]=+0.02+/-0.05 metallicity. V570 Per turns out to be a detached system, with shallow eclipses of Delta B = Delta V =0.13 mag amplitude at a distance of 123+/-3 pc, in fine agreement with Hipparcos 117 (lower lim. 104, upper lim. 132) pc distance. V570 Per is composed by unperturbed components of F2 and F5 spectral types and masses of 1.457+/-0.004 and 1.351+/-0.004 Msun respectively, which do not show surface activity. Both components are still within the Main Sequence band and are dynamically relaxed to co-rotation with the orbital motion. The system is particularly interesting because both components have their masses in the range where transition occurs between convective and radiative cores, and where differences between families of stellar evolutionary tracks show appreciable differences. The position of the components of V570 Per on the temperature-luminosity plane is compared with Padova, Geneva, Granada and Teramo-04 theoretical stellar models. The comparison provides different best fit metallicities and ages, with [Fe/H] ranging from +0.07 to +0.18, and ages from 0.6 to 1.0 Gyr.