We are grateful to Sveneric Johansson for providing us with unpublished Fe II laboratory wavelengths and information regarding Fe wavelength measurements. We thank Paul Barklem for providing us with unpublished collisional broadening data for Fe I lines and helpful discussions. We gratefully acknowledge Robert L. Kurucz for the use of his unpublished, low Fe opacity distribution functions. The constructive suggestions by an anonymous referee are much appreciated. MA and CAP acknowledge the generous financial support of Nordita. The convection simulations were performed at UNIC supercomputing center in Denmark, whose support is greatly appreciated. Extensive use have been made of the VALD database (Kupka et al. 1999), which has been very helpful.
© European Southern Observatory (ESO) 2000
Online publication: July 7, 2000