Flares on dMe stars - IUE and optical observations of AT Mic, and comparison of far-ultraviolet stellar and solar flares

Astronomy and Astrophysics – Astronomy

Scientific paper

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M Stars, Solar Flares, Spectrum Analysis, Stellar Flares, Ubv Spectra, Balmer Series, Far Ultraviolet Radiation, Iue, Lyman Alpha Radiation, Skylab Program, Stellar Spectrophotometry, Stellar Temperature

Scientific paper

Observations of AT Mic obtained before and/or during a large flare on Sept. 19, 1980, using the short-wave and long-wave cameras of the IUE satellite, a UBV photometer on the 0.5-m SAAO telescope, and a 380-510-nm Cassegrain spectrophotometer on the 1.9-m SAAO telescope are reported. The data are presented in tables and graphs and compared with data for the quiescent state of AT Mic and Skylab calibrated solar UV spectra. Transition-region-line surface fluxes for the quiescent AT Mic are found to be 10-40 times those of the quiescent sun; during the flare (duration 30 min) line fluxes are enhanced by a factor of seven, with line power 10,000-100,000 times that of the solar flare observed by Skylab on June 15, 1973.

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