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Astron. Astrophys. 342, 300-310 (1999) AcknowledgementsThis work was supported by the NASA Astrophysics Theory Program under grant NAG5-3027 (P.H., Z.E.M. and P.U.), by NASA/MSFC under grant NAG8-839 (P.H. and Z.E.M.), by NSF under grant ATM-9526196 (P.H. and Z.E.M.), and by NATO under grant CRG-910058 (P.U. and Z.E.M.). Z.E.M. also acknowledges the support of this work by the Alexander von Humboldt Foundation. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: December 22, 1998 ![]() |