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Astron. Astrophys. 336, 786-790 (1998) AcknowledgementsThe authors acknowledge D. Hils and P.L. Bender for correcting an error in our calculations. The work was partially supported by Russian Fund for Basic Research through Grant No 98-02-16801, the INTAS Grant No 93-3364, and by NTP "Astronomy" (project 1.4.4.1) of the Ministry of Science of Russia.
© European Southern Observatory (ESO) 1998 Online publication: July 20, 1998 ![]() |