Observations of a Flare on AU MIC

Details Observations of a Flare on AU MIC Observations of a Flare on AU MIC

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.5104r&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #51.04; Bulletin of the American Astronomical Society, Vol. 24, p.1206

Astronomy and Astrophysics

Astronomy

Scientific paper

We report the results of a coordinated observing campaign of the active dMe flare star AU Mic, carried out on 1992 Sept 9. Participating instruments include the HST and IUE satellites and the 3.9m Anglo-Australian Telescope. During this campaign a long duration, 1.5 mag (U band) flare was detected, with the maximum phase observed simultaneously with the IUE and AAT and the decay phase monitored by all three instruments. The AAT observations consisted of a time series of CCD exposures covering the wavelength range 3650-4450 Angstroms and having a temporal resolution of 6 seconds. The impulsive phase lasted for about 1 minute and was therefore well resolved by these observations. The flare showed pronounced broadening of the Balmer series, with the Balmer line fluxes increasing with the continuum during the impulsive phase but having a much longer decay time. A pronounced HeII (4026 Angstroms ) emission was seen during the flare, with some indication that this line increased in absorption strength about 30 seconds before the continuum increase. The CaII H and K lines decreased in strength during the impulsive and early decay phase of the event, but recovered during the later decay phase. A low resolution LWP exposure was taken by the IUE during the peak of the flare. Combining this with the optical data gives an almost complete coverage of the flare spectrum from 2200 to 4500 Angstroms . We discuss the implications of these observations in relation to current flare models.

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