Astron. Astrophys. 352, 129-137 (1999)

Acknowledgements

PCvdK thanks Jeremy Mould for hospitality at the Mount Stromlo and Siding Spring Observatories, where most of this work was done, and Ken Freeman for discussions, the Space Telescope Science Institute and Ron Allen for hospitality, when the final version of this paper was prepared, and the Faculty of Mathematics and Natural Sciences of the University of Groningen for financial support that made these visits possible. RdG was supported by NASA grants NAG 5-3428 and NAG 5-6403.

© European Southern Observatory (ESO) 1999

Online publication: November 23, 1999
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