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Published online by Cambridge University Press: 14 August 2015
Twenty one high resolution IUE observations made over a two year interval revealed remarkable changes in the profiles of the resonance lines of C IV, N V and Si IV in the B 0.5 IVe star λ Cas. Narrow (FWHM < 100 km s−1), blue shifted (v < 1500 km s−1), absorption components of varying strenghts are observed in addition to the broad, asymmetric, low-velocity absorption lines which seem to be steady.