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

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.