The kinetics of hydrogen in the chromospheres of red dwarfs

Details The kinetics of hydrogen in the chromospheres of red dwarfs The kinetics of hydrogen in the chromospheres of red dwarfs

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990azh....67..115b&link_type=abstract

Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 67, Jan.-Feb. 1990, p. 115-125. In Russian.

Astronomy and Astrophysics

Astronomy

4

Chromosphere, Gas Dynamics, Hydrogen, Red Dwarf Stars, Atomic Excitations, Balmer Series, Light Curve, Optical Thickness, Radiative Transfer, Stellar Flares

Scientific paper

A method for solving the stationary equations for an eight-level hydrogen atom is presented, which approximately accounts for radiative transfer in the lines in an optically thick layer. The ionization and excitation of the H atoms are caused by electron collisions, neglecting the influence of photospheric radiation. The medium stays motionless and the escape of photons from the layer is related to gradual frequency diffusion during multiple scatterings. The mean layer probabilities of photon escape are determined for a finite thickness layer with a uniform distribution of primary photon sources and an absorption coefficient that accounts for Stark and Doppler effects. The method is used to interpret data on the Balmer decrement in the maximum of a stellar flare on YZ CMi that occurred on March 4, 1985.

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