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Astron. Astrophys. 333, 687-701 (1998) AcknowledgementsThe authors are indebted to the referee, Dr. Peter Woitke, for his meticulous review of this paper and for his valuable comments. The work of YAF has been done in part under the auspices of the Ministère de l'Enseignement Supérieur et de la Recherche (grant 1196/MDLM/CB) in 1996 and of the Aix-Marseille I University (grant 34 PR 1049) in 1997. YAF acknowledges also the support from the Russian Foundation for Basic Research (grant 95-02-06359). ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: April 20, 1998 ![]() |