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Astron. Astrophys. 334, L17-L20 (1998) AcknowledgementsThe author thanks Ed van den Heuvel for discussions and many helpful comments on the manuscript. This research was supported in part by the NWO Spinoza-grant SPI 78-327. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: May 12, 1998 ![]() |