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Astron. Astrophys. 362, 1008-1019 (2000) AcknowledgementsWe thank the referee (D. Schönberner) for his remarks which have allowed us to improve our analysis and the text of the paper. This work was in part supported from grants No. 2.P03D.002.13 & 2.P03D.020.17 financed by the Polish State Committee for Scientific Research. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: October 30, 2000 ![]() |