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Astron. Astrophys. 332, L57-L60 (1998) AcknowledgementsWe thank Jan van Paradijs for reading the manuscript. This work was partially supported through NWO Spinoza grant 08-0 to E.P.J. van den Heuvel and RFBR Grant 96-02-16351. L.R.Y acknowledges hospitality of the Astronomical Institute "Anton Pannekoek" and Meudon Observatory. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: March 30, 1998 ![]() |