Gliese 825 - A new flare star

Astronomy and Astrophysics – Astronomy

Scientific paper

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Emission Spectra, Flare Stars, Stellar Spectra, Stellar Spectrophotometry, Ultraviolet Spectra, Chromosphere, Light Curve, Stellar Atmospheres, Stellar Luminosity, Stellar Magnitude, Stellar Motions, Variable Stars

Scientific paper

The bright dM star Gl 825 is shown to be a flare star, and comparison with similar stars indicates that its overall activity level may be unusually low for a star of its spectral type. Characteristics of the star such as the absence of chromospheric emission lines in its UV spectrum, and its space motion, are consistent with a somewhat later evolutionary stage than that of typical solar neighborhood UV Ceti flare stars and with its reduced level of chromospheric activity. It is concluded that the absence of BY Draconis variations throughout 1979 is also consistent with the interpretation.

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