We are grateful to A. Kaufer for his help with obtaining some of the spectra at La Silla and to S. Tubbesing for his help with the data reduction. Our work benefits much from the beautiful spectrum of Vega provided by A. Korn. We express our thanks to our referee, Dr. D. Kiselman, for many useful suggestions and we would also like to acknowledge helpful discussions with J. Puls. RPK likes to thank the director and staff of Steward Observatory, Tucson, for their hospitality and support during his sabbatical. Funding through the MPIA, Garching, is gratefully acknowledged (NP).
© European Southern Observatory (ESO) 2000
Online publication: July 13, 2000