We would like to thank Rolf Kudritzki, Kim Venn, Norbert Langer, Robert Rolleston and Robert Ryans for many useful discussions. This work has made use of model atmosphere programs made available through the PPARC supported Collaborative Computational Project No. 7. NDME would like to acknowledge financial support from the Department of Education for Northern Ireland, while DJL is grateful for support from the Bundesminister für Forschung und Technologie under grant 010 R 90080. We are grateful to the British Council and the Akademischer Austauschdienst for funding an ARC program of working visits between Munich and Belfast.
© European Southern Observatory (ESO) 1999
Online publication: September 2, 1999