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Astron. Astrophys. 318, L17-L20 (1997) AcknowledgementsOne of the authors (M.D.D.) would like to thank the staff of the Kiepenheuer-Institut for their kind hospitality during his visit there. Critical comments from the referees are highly appreciated. Thanks are also due to Dr. H. Balthasar for a careful reading of the manuscript and making some suggestions. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1997 Online publication: July 8, 1998 ![]() |