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The active late-type star AB Doradus was observed in February 1996 with theGoddard High Resolution Spectrograph of the Hubble Space Telescope using thelow resolution G140L grating. The observations covered one half of the star'srotation cycle (P = 0.514 d) with 11.5 min time resolution. The strong coronalFe XXI 1354.094 line formed at 10^7 K was analysed and its emission measure(EM) derived. This EM is much higher than that derived from recent XMM-Newtonobservations (Guedel et al. 2001), and earlier EXOSAT (Collier Cameron et al.1988) and ASCA/EUVE (Mewe et al. 1996) data, as well, requiring a variabilityby a factor of 5. The physical reason for the variability remains unknown,since (outside flares) the observed broad band variability of AB Dor is muchsmaller.Comment: 6 pages, 4 figures, accepted for Astronomy and Astrophysics, May 200

The coronal FeXXI λ1354.094 line in AB Doradus