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Astron. Astrophys. 324, 1027-1035


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The EUV spectrum of Ceti: an active Sun

E. Landi1 and M. Landini1, and G. Del Zanna2

1Department of Astronomy and Space Science, University of Florence, Italy
2Center 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: FORMULA Ceti - stars: coronae - stars: late-type - ultraviolett: stars

Send offprint requests to: E. Landi


© European Southern Observatory (ESO) 1997

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