M. Asplund is warmly thanked for computing the grid of model atmospheres. We thank B. Plez for providing the grid of NMARCS models and P. Collard for his help in getting and processing the spectroscopic data. We are grateful to R. de la Reza and N. Mowlavi for useful comments on the manuscript. P. de Laverny acknowledges support from the Société de Secours des Amis des Sciences . M.P. is very thankful to the GRAAL and the University of Montpellier II for their kind hospitality and support. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France.
© European Southern Observatory (ESO) 1999
Online publication: February 23, 1999