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Astron. Astrophys. 323, 363-373 (1997) AcknowledgementsThis work has been supported by the University of Geneva (Geneva Observatory) and the Swiss National Science Foundation (FNRS). We especially thank D. Pfenniger and J-R. Roy for instructive discussions and a careful reading of the manuscript as well as the referee, T.G. Hawarden, for very useful and detailed comments. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1997 Online publication: June 5, 1998 ![]() |