Fast spectrophotometry of the flare star EV lacertae

Origin of the Blue Continuum Radiation in the Flare Spectra of dMe Stars

“…In a study of the fine time structure of two flares on AD Leo, Lovkaya [11] has found that at the maximum brightness these two flares radiated as absolute black bodies with temperatures of approximately 1.2 and 1.12 eV. Based on a detailed colorimetric analysis, Zhilyaev et al [12] have determined a temperature T ≈ 1.16 eV for the blackbody radiation at the peak of a strong flare on the red dwarf EV Lac. The authors [1] have found (p. 354) that the homogeneous plane layer with N H = 10 16 cm −3 , ∆z = 1.5 · 10 6 cm, and T = 11000 K generates the energy distribution in the continuum, which is in close agreement with the energy distribution in the continuous spectrum at the maximum brightness of another flare on EV Lac.…”

“…Additional remarks. Sobolev and Grinin [15] 13 assume that the line spectrum of 12 It is assumed here that there is no connection between the increasing in N H and the change in the magnetic field H during all non-stationary radiative cooling of the post-shock gas. 13 The brief version of this article is available via the ADS Article Service in the Proceedings of Cool stellar flares is formed in the chromospheric layers where "gas-dynamic effects caused by the rapid release of energy play an extremely important role [5]."…”