A Spectroscopic Modelling Method for the Detached Eclipsing Binaries to Derive Atmospheric Parameters

TL;DR

This paper introduces a spectroscopic modelling method to determine atmospheric parameters of stars in detached eclipsing binary systems using multi-epoch spectra, applicable across different spectral resolutions.

Contribution

The method combines orbital and luminosity analysis with spectral synthesis to accurately derive atmospheric parameters from double-lined spectra.

Findings

Robust parameter derivation for LAMOST data

Applicable to various spectral resolutions

Effective for detached eclipsing binaries

Abstract

Based on luminosity contributions, we develop a spectroscopic modelling method to derive atmospheric parameters of component stars in binary systems. The method is designed for those spectra of binaries which show double-lined features due to the radial velocities differences between the component stars. We first derive the orbital parameters and the stellar radii by solving the light and radial velocity curves. Then the luminosity contributions in different phases can be calculated. The synthesised double-lined spectra model is constructed by superposing theoretical single-star spectra according to the luminosity contributions. Finally, we derive the atmospheric parameters of each component star by the model fitting method. For multi-epoch double-lined spectra observed by the Large sky Area Multi-Object Spectroscopic Telescope (LAMOST) Medium Resolution Survey ($R \sim 7500$), our method gives robust results for detached eclipsing binary systems observed in different orbital phases. Furthermore, this method can also be applied to other spectroscopic data with different resolutions as long as the systems are detached eclipsing binaries with nearly spherical stars.