Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.1502c&link_type=abstract
American Astronomical Society, 183rd AAS Meeting, #15.02; Bulletin of the American Astronomical Society, Vol. 25, p.1313
Astronomy and Astrophysics
Astronomy
Scientific paper
The flare star AU Mic was observed by the EUVE Deep Survey Instrument on 1992 July 14-18. A large flare was detected in the Deep Survey Lexan/Boron (65 - 190 A) band and the SW (70 - 190 A) and MW (140 - 380 A) spectrometers. The flare consisted of a sharp impulsive peak lasting approximately 2 hours followed by a decaying tail lasting about a day. We present a simple, dynamical model which is consistent with the the DS light curve and reproduces the strongest spectral lines in the publicly released EUVE archive spectra of this observation. In this model, we assume the long decay time is due to an ejected, magnetically confined, low beta, plasmoid expanding self similarly in the stellar wind. Initial estimates of the mass of the plasmoid indicate that these types of ejections may make a significant contribution to the mass balance of the ISM and may be responsible for a large part of the angular momentum evolution of active, late type stars.
Cully Scott L.
Fisher George H.
Siegmund Oswald H. W.
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