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Astron. Astrophys. 324, 1027-1035 (1997)

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The EUV spectrum of [FORMULA] Ceti: an active Sun

E. Landi 1, M. Landini 1 and G. Del Zanna 2

1 Department of Astronomy and Space Science, University of Florence, Italy
2 Center for Astrophysics, Un. of Central Lanscashire, Preston, UK

Received 12 December 1996 / Accepted 3 March 1997

Abstract

The spectrum of [FORMULA]  Cet in the region 80 -370 Å  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 [FORMULA], 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.

Key words: stars: individual: Ceti – stars: coronae – stars: late-type – ultraviolett: stars

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© European Southern Observatory (ESO) 1997

Online publication: May 5, 1998

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