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

The multi-color photometric and spectroscopic(1) 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 = 3300 K; T-2 = 3106 K; M-1 = 0.36 M-circle dot,; M-2 = 0.18 M-circle dot; R-1 = 0.46 R-circle dot; R-2 = 0.50 R-circle dot; L-1 = 0.030 L-circle dot; L-2 = 0.026 L-circle dot; i = 89.2 degrees; a = 5.97 R-circle dot; 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. (C) 2012 Elsevier B.V. All rights reserved.