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Astron. Astrophys. 319, 578-588 (1997) AcknowledgementsG.H.J. van den Oord acknowledges financial support from the Netherlands Organization for Scientific Research (NWO). Research at Armagh Observatory is grant-aided by the Dept. of Education for N. Ireland. We thank the referee for carefully reading the manuscript and for pointing out the necessity to consider over-ionized winds. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1997 Online publication: July 3, 1998 ![]() |