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Astron. Astrophys. 342, 192-200 (1999) AcknowledgementsD.A.B. is deeply thankful for hospitality at the Copernicus Astronomical center in Warsaw. This work was supported by RFBR (grant 96-02-16870a), RFBR-DFG (grant 96-02-00177G), INTAS (grant 96-0542), and KBN (grant 2 P03D 014 13). ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: December 22, 1998 ![]() |