2019MNRAS.488.5279K

Detached eclipsing binaries are remarkable systems to provide accurate fundamental stellar parameters. Fundamental stellar parameters and the metallicity values of stellar systems are needed to deeply understand stellar evolution and formation. In this study, we focus on the detailed spectroscopic and photometric studies of three detached eclipsing binary systems, V372 And, V2080 Cyg, and CF Lyn, to obtain their accurate stellar and atmospheric parameters, and chemical compositions. An analysis of light and radial velocity curves was carried out to derive the orbital and stellar parameters. The disentangled spectra of component stars were obtained for the spectroscopic analysis. Final T_eff, log g, ξ, vsin i parameters and the element abundances of component stars were derived by using the spectrum synthesis method. The fundamental stellar parameters were determined with a high certainty for V372 And, V2080 Cyg (∼1-2 per cent) and with accuracy for CF Lyn (∼2-6 per cent). The evolutionary status of the systems was examined and their ages were obtained. It was found that the component stars of V2080 Cyg have similar iron abundances, slightly lower than the solar iron abundance. Additionally, we show that the primary component of CF Lyn exhibits a non-spherical shape with an 80 per cent Roche lobe filling factor. It could be estimated that CF Lyn will start its first Roche overflow in the next 0.02 Gyr.