  Calculations of the emission spectrum of a homogeneous plane layer of pure
hydrogen plasma taking into account nonlinear effects (the influence of
bremsstrahlung and recombination radiation of the layer itself on its Menzel
factors) [Morchenko et al., Ap&SS, Vol. 357, article id. 119 (2015)] show that
the blue component of the optical continuum during the impulsive phase of large
flares on dMe stars originates from the near-photospheric layers [Grinin and
Sobolev, Afz, Vol. 13, 587 (1977)]. The gas behind the front of a stationary
radiative shock wave propagating in the red dwarf chromosphere toward the
photosphere is not capable of generating the blackbody radiation observed at
the maximum brightness of the flares.
