Abstract
The spectra of a flare on YZ CMi, obtained with a temporal resolution of 60 s on 1985 March over the wavelength range 3600-4400 A, are analysed using a gas-dynamic model. In this model, the optical radiation in the U band, outside of flare maximum, is produced by a condensation formed during the gas-dynamic process. The numerical modelling of such a process in the red-dwarf atmosphere shows that the source of the optical radiation is a dense, cool plasma with a small height. It is supposed that the emitting source is responsible for the radiation from the higher Balmer lines when they are at their maximum intensity
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