The first author (JES) thanks the Norwegian Research Council for travel support. He also thanks the Department of Astronomy at the University of Texas and the Department of Astronomy at the University of Cape Town for generous support during sabbatical visits. We also thank Marion Frueh who did observations at McDonald Observatory for us - and all the telescope allocation committees who allocated observing time for this project. Finally we thank the referee G. Savonije for extremely helpful comments, and to Liv Larssen for patiently working with the manuscript.
© European Southern Observatory (ESO) 1998
Online publication: March 30, 1998