Astron. Astrophys. 321, 177-188 (1997)

Acknowledgements

The authors would like to thank the referee, Dr. van den Oord, for very useful comments that helped to clear up some of the issues discussed. The authors would also like to thank Andrew Collier Cameron and Miguel Ferreira for useful discussions. MMJ acknowledges the support of a PPARC Advanced Fellowship during the course of this work. YCU would like to thank the Astrophysics Division at RAL for their hospitality and acknowledges the support through a PPARC funded PDRA during part of the work.

© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998
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