A comparison of far-UV spectra of solar and stellar flares

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Far Ultraviolet Radiation, Solar Flares, Solar Spectra, Stellar Flares, Stellar Spectra, Continuous Radiation, Flare Stars, Iue, Skylab Program, Stellar Radiation

Scientific paper

The IUE observations of the flare star AT Microscopii while in a flaring state are compared with solar flare observations in a similar wavelength range taken with a slit spectrograph on Skylab. With emission in the UV lines in each case reduced to power (erg s-1), the AT Mic values are between 10**4 and 10**5 times the solar value except for Ly alpha, which is much less. When normalized to the C II 1335 line feature, lines due to Si IV, C IV and He II are significantly more intense in the AT Mic than the solar flare spectra. There is a strong continuum in the stellar spectra, which is compared with that in other IUE flare star and Skylab solar spectra. The continuum intensity is strongly correlated with the C IV 1550 A line intensity, supporting the notion that the continua seen in flare star IUE spectra arise from the heating of the stellar photosphere by UV lines.

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