Absolute properties of the main-sequence eclipsing binary FM Leo

TL;DR

This paper presents spectroscopic and photometric analysis of the eclipsing binary FM Leo, deriving precise stellar and orbital parameters, and discusses the evolutionary stage of its main-sequence components at approximately 3 billion years old.

Contribution

First combined spectroscopic and photometric study of FM Leo providing detailed stellar and orbital parameters with modern modeling techniques.

Findings

Masses: M1=1.318 and M2=1.287 M_sun

Radii: R1=1.648 and R2=1.511 R_sun

System age estimated at about 3 Gyr

Abstract

First spectroscopic and new photometric observations of the eclipsing binary FM Leo are presented. The main aims were to determine orbital and stellar parameters of two components and their evolutionary stage. First spectroscopic observations of the system were obtained with DDO and PST spectrographs. The results of the orbital solution from radial velocity curves are combined with those derived from the light-curve analysis (ASAS-3 photometry and supplementary observations of eclipses with 1 m and 0.35 m telescopes) to derive orbital and stellar parameters. JKTEBOP, Wilson-Devinney binary modelling codes and a two-dimensional cross-correlation (TODCOR) method were applied for the analysis. We find the masses to be M_1 = 1.318 $\pm$ 0.007 and M_2 = 1.287 $\pm$ 0.007 M_sun, the radii to be R_1 = 1.648 $\pm$ 0.043 and R_2 = 1.511 $\pm$ 0.049 R_sun for primary and secondary stars, respectively. The evolutionary stage of the system is briefly discussed by comparing physical parameters with current stellar evolution models. We find the components are located at the main sequence, with an age of about 3 Gyr.