NSVS 07394765: A new low-mass eclipsing binary below 0.6 M⊙M⊙

The multi-color photometric and spectroscopic1 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: T1 = 3300 K; T2 = 3106 K; M1 = 0.36 M⊙M⊙; M2 = 0.18 M⊙M⊙; R1 = 0.46 R⊙R⊙; R2 = 0.50 R⊙R⊙; L1 = 0.030 L⊙L⊙; L2 = 0.026 L⊙;i=89.2°;a=5.97R⊙;d=28 pc. The chromospheric activity of its components is revealed by strong emission in the Hα 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.

► We present photometric and spectroscopic observations and analysis of NSVS 07394765.
► The resultant light and radial velocities were analysed.
► This system belongs to a very rare class of low-mass eclipsing binaries.