2021PASP..133d4202P

We carried out a photometric and spectroscopic analysis for the eclipsing binary TIC 157376469 using the TESS and LAMOST data. A new linear ephemeris is given. By fitting the light curves and radial velocity curves with the Wilson-Devinney code, it apperas that the binary is composed of two K-type main-sequence stars. The orbit of the binary is slightly eccentric (e~0.0017) and the primary is a spotted active star. The masses and radii of the two components are determined to be M₁=0.704±0.028M_☉, R₁=0.754±0.010R_☉, M₂=0.539±0.021M_☉, R₂=0.543±0.007R_☉, respectively. The temperature ratio (T₂/T₁) is determined to be ∼0.879. Under a assumption that the primary temperature is T₁=4740K, comparisons to the PARSEC v1.2 isochrones show that for the primary the radius is oversized of ∼16%, and the effective temperature is cooler of ∼300K (∼6%). While, the properties of the secondary are almost in agreement with the predictions of the model.