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Astron. Astrophys. 324, 281-288 (1997) AcknowledgementsAuthors thank an anonymous referee for helpful comments. A. Gadun is grateful to European Southern Observatory (Grant A-07-015) and to the Joint Fund of the Government of Ukraine and International Science Foundation (Grant K11100) for the support of this work. We are indebted to R. García López for carefully reading the manuscript. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1997 Online publication: May 26, 1998 ![]() |