UV and optical observations of AT Microscop 2

Details UV and optical observations of AT Microscop 2 UV and optical observations of AT Microscop 2

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.263...91a&link_type=abstract

In ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE p 91-94

Astronomy and Astrophysics

Astrophysics

1

Chromosphere, Dwarf Stars, Ultraviolet Spectra, Iue, Spectral Line Width, Stellar Flares, Stellar Spectra

Scientific paper

The red dwarf binary AT Mic was observed in 1985 by IUE in the UV and optical wavelength regions. In the U-band flares were observed at a rate of 1 per hour. In the UV region surface line fluxes are enhanced compared to those of the quiet Sun and show closer relation to values which are characteristic of very active regions on the Sun. Hot lines (C IV, Si IV) show larger broadening and negative frequency shifts whereas cooler lines (Fe II, Mg II) are less broadened and reveal small negative or positive line shifts. Improved radial velocity determinations of AT Mic are essential for the interpretation of the results.

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