The EUV Spectrum of kappa Ceti: an Active Sun

E. Landi, M. Landini, G. Del Zanna

Astronomy and Astrophysics, v. 324, p. 1027-1035.

Abstract

The spectrum of kappa Cet in the region 80-370{AA} observed by EUVE Spectrometers is analyzed to investigate the transition region and the corona of the star. The star appears to be in a rather quiet condition and no evidence exists of flare-like lines observed in many active stars. Several emission lines of moderately ionized iron (from Fe IX to Fe XVIII) are identified and used together with I.U.E. observations to evaluate the differential emission measure (DEM). The DEM peaks at about 3x10^6^K, a value typical of solar active regions. This is confirmed by a comparison with the spectrum of an Active Region of the Solar Corona measured by the Coronal Diagnostic Spectrometer on SOHO showing very similar features.

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