Astron. Astrophys. 356, 1010-1022 (2000)

Acknowledgements

We are grateful to the Royal Society and the CNRS for financial support under the European Science Exchange Programme. One of the authors (DRF) gratefully acknowledges the award of a research fellowship by the University of Durham. We also thank the anonymous referee for his useful comments.

© European Southern Observatory (ESO) 2000

Online publication: April 17, 2000
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