NSVS07394765: A new low-mass eclipsing binary below 0.6 M_sun

TL;DR

This study presents detailed photometric and spectroscopic analysis of the newly discovered low-mass eclipsing binary NSVS 07394765, providing precise system parameters and revealing chromospheric activity, contributing valuable data below 0.6 solar masses.

Contribution

The paper offers the first detailed characterization of NSVS 07394765, including mass, radius, temperature, and activity, expanding knowledge of low-mass binary systems below 0.6 solar masses.

Findings

System parameters: M1=0.36 M_sun, M2=0.18 M_sun, R1=0.46 R_sun, R2=0.50 R_sun.

Detected chromospheric activity and flares in both components.

Derived empirical relations for mass-radius and mass-temperature for low-mass binaries.

Abstract

The multi-color photometric and spectroscopic (based on observations obtained with the T{\"U}B{\.I}TAK National Observatory 1.5-meter telescope, which is owned and operated by the T{\"U}B{\.I}TAK) observations of the newly discovered eclipsing binary NSVS 07394765 were obtained. The resultant light and radial velocities were analysed and the global parameters of the system: T$_{1}$=3 300 K; T$_{2}$=3 106 K; M$_1$=0.36 M$_{\odot}$; M$_2$=0.18 M$_{\odot}$; R$_1$=0.46 R$_{\odot}$; R$_2$=0.50 R$_{\odot}$; L$_{1}$=0.030 L$_{\odot}$; L$_2$=0.026 L$_{\odot}$; $i=89.2{^\circ}$; $a=5.97$ R$_{\odot}$; $d=28$ pc. The chromospheric activity of its components is revealed by strong emission in the H$\alpha$ line and observed flares. Empirical relations for mass-radius and mass-temperature are derived on the basis of the parameters of known binaries with low-mass dM components.