V570 Per: Characterization of a Benchmark Eclipsing Binary

Abstract

This study presents a comprehensive analysis of the detached binary system V570 Per through combined photometric, spectroscopic, and astrometric observations. By disentangling the composite spectra, precise fundamental parameters and detailed chemical abundances were determined for both stars. The primary component has a mass of 1.4569 0.0100 +0.0094 M⊙, a radius of 1.543 0.009 +0.012 R⊙, an effective temperature of 6556 26 +64 K, and a metallicity of 0.18 0.01 + +0.03 dex, while the secondary has a mass of 1.3579 0.0089 +0.0094 M⊙, a radius of 1.377 0.015 +0.013 R⊙, an effective temperature of 6468 21 +32 K, and a metallicity of 0.15 0.01 + +0.02 dex. The system is estimated to be 577 60 +60 Myr old with a synchronized orbit. The available O − C data imply a minimum mass of 0.57M⊙ or 0.11M⊙ for the third body, corresponding to eccentric and circular orbits, respectively. MESA evolutionary models indicate that the primary will fill its Roche lobe and begin mass transfer to the secondary in about 2.8 Gyr, whereas the secondary will reach the terminal-age main sequence in approximately 3.2 Gyr. The chemical composition of both stars shows remarkable consistency, confirming their common origin, except for calcium, which is significantly enhanced in the primary. Line measurements support this difference and are therefore interpreted as an intrinsic abundance variation rather than an artifact of the analysis. The overall solar-rich metallicity, combined with a relatively low α-element content, links V570 Per to the Galactic thin-disk population. In addition, Galactic orbit analyses of open clusters in the solar neighborhood have revealed that the V570 Per system may have originated from the Melotte 25 open cluster.