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The Balmer decrement in red dwarfs spectra during the flares and quiescent state

Published online by Cambridge University Press:  23 September 2016

M.M. Katsova
M.M. Katsova*
Affiliation:
Sternberg State Astronomical Institute, Moscow State University, 119899 Moscow V-234, U.S.S.R.

Abstract

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The Balmer decrements observed from flare stars during the flares and out-of-flare are analyzed on the basis of our new consideration of hydrogen atom kinetics. The steep Balmer decrements correspond to the emission source with electron density ne ≤ 1013 cm−3 optical depth at the Lα line centre τ(Lα) ≤ 107 for T=104, The low-sloping Balmer decrement, being typical for flare maximum of red dwarfs as well as for several flare stars with measurable X-ray emission out-of-flare, are described by ne = 3 · 1013–1014 cm−3 and τ(Lα)= 107 − 108 for T=(1−1, 5) · 104 K.

Type
IV Theoretical Problems and Interpretation of Observations
Information
Symposium - International Astronomical Union , Volume 137: Flare Stars in Star Clusters, Association and Solar Vicinity , 1990 , pp. 321 - 323
Copyright
Copyright © Kluwer 1990 

References

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