  We have examined radial velocities and fluxes of ultraviolet emission lines
at different epochs, deduced from archival IUE and GRHS/HST spectra. The line
fluxes give electron densities and were in addition used to calculate emission
measures, suggesting line formation in regions rather smaller than the binary
separation. Examination of the radial velocities led to us to find a systematic
redshift of the high ionization resonance lines with respect to the
intercombination, and HeII lines. Possible explanations of the redshift and the
high resolution GHRS CIV profile are discussed. We favour that involving
resonance line absorption by a circum-binary region most probably in an
asymmetric wind interaction shell or in a wind from the accretion disk.
