# Detailed spectroscopic and photometric study of three detached eclipsing binaries

## TL;DR

This study provides detailed spectroscopic and photometric analyses of three detached eclipsing binaries, deriving their stellar parameters, chemical compositions, and evolutionary statuses with high precision to enhance understanding of stellar evolution.

## Contribution

It offers a comprehensive spectroscopic and photometric analysis of three detached eclipsing binaries, including their chemical compositions and evolutionary states, with improved accuracy over previous studies.

## Key findings

- Component stars of V2080 Cyg have similar, slightly sub-solar iron abundance.
- The primary of CF Lyn is nearly filling its Roche lobe and will begin Roche overflow in 0.02 Gyr.
- Stellar parameters were determined with 1-6% accuracy.

## Abstract

Detached eclipsing binaries are remarkable systems to provide accurate fundamental stellar parameters. The fundamental stellar parameters and the metallicity values of stellar systems are needed to deeply understand the 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, 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 \teff, \logg, $\xi$, \vsini\, 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 ($\sim$$1-2$\%) and with an accuracy for CF\,Lyn ($\sim$$2-6$\%). 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 abundance which is slightly lower than solar iron abundance. Additionally, we showed that the primary component of CF\,Lyn exhibits a non-spherical shape with its 80\% Roche lobe filling factor. It could be estimated that CF\,Lyn will start its first Roche overflow in the next 0.02\,Gyr.