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Astron. Astrophys. 333, 379-384 (1998) AcknowledgementsWe thank A. Loeb and H. C. Spruit for comments on the manuscript. AU was supported in part by an National Science Foundation graduate fellowship. We acknowledge NSF grant AST9530478. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: April 15, 1998 ![]() |