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Astron. Astrophys. 341, 499-526 (1999) AcknowledgementsIt is a pleasure to thank P. Höflich and H.-T. Janka for useful discussions and M. Guidry for carefully reading the manuscript. This work was supported by the Swiss National Science Foundation under grants No. 20-47252.96 and 2000-53798.98 and in part by the National Science Foundation under Grant No. PHY 94-07194 (S.R., M.L., F.-K.T.), M.B.D. acknowledges the support of the Royal Society through a University Research Fellowship, part of the work by W.B. has been supported by the Swiss National Science Foundation, T.P. was supported by the US-Israel BSF grant 95-328. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: December 4, 1998 ![]() |