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Astron. Astrophys. 331, L37-L40 (1998) AcknowledgementsThe work was partially supported by Russian Fund for Basic Research through Grant No 95-02-06053-a, by the INTAS Grant No 93-3364 and by the Russian Ministry of Science NTP "Astronomija", project 1.4.4.1. The authors thank Dr. A.N.Rakhmanov for help in drawing the figures and the anonymous referee for valuable notes. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: March 3, 1998 ![]() |