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An analysis of the continuum light in the 3500 – 8500Å region from a flare observed on the dwarf M star Gliese 234AB (= V577 Mon)

Published online by Cambridge University Press:  27 September 2017

J.G. Doyle ,
G.H.J. van den Oord  and
C.J. Butler
J.G. Doyle
Affiliation:
Armagh Observatory, Armagh, BT61 9DG, N. Ireland
G.H.J. van den Oord
Affiliation:
Dept. of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, Scotland
C.J. Butler
Affiliation:
Armagh Observatory, Armagh, BT61 9DG, N. Ireland

Abstract

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Relative energies are given for the U, B, V, R and I bands for a-3.8 magnitude U-band flare observed on the dwarf dMe star Gl 234 AB on 28 Feb 1985. This flare had a 45 second rise time and 20 minute decay time. The total flare energy from all five bands during the flare was 7 1031 erg, 34% of this total was from the U-band and 20% from the two near infrared R and I bands. The energy density (per frequency interval) implied a rising continuum towards the red, however this only lasted for approximately 20-40 seconds, i.e. during the impulsive phase, after-which the excess flare emission could not be detected in tlie near infrared bands. Of the various models fitted to the flare data (i.e. optical synchrotron, bound-free emission and free-free emission), bound-free emission seems the most promising.

Type
Session I: Stellar Flares
Information
International Astronomical Union Colloquium , Volume 104 , Issue 2: Solar and Stellar Flares , 1989 , pp. 91 - 94
Copyright
Copyright © Kluwer 1989

References

[1] Doyle, J.G., Butler, C.J., Byrne, P.B., van den Oord, G.H.J.: 1988, Astron. Astrophys. 103, 220 Google Scholar
[2] Giampapa, M.S., Wordcn, S.P., Linsky, J.L.: 1982, Astrophys. J 258, 740 CrossRefGoogle Scholar