We are indebted to T. Augusteijn and S. Ortolani for the observation and reduction of photometric data. We are also grateful to P. D. Singh for the calculation of Franck-Condon factors of the blue systems of CH and CN, to B. Castilho for calculations of molecular intensity factors, and to B. Fuchs for making available the STN proper motion measurements of our stars. We also thank P. Bonifacio for his very useful remarks as a Referee of the paper. We acknowledge partial financial support from the Observatory of Paris, CNPq/CNRS and Fapesp. BN acknowledges financial support by the Carlsberg Foundation. TCB acknowledges financial support by the National Science Foundation (US), through grant AST 95-29454. BP thanks S. Johansson and the Atomic spectroscopy division of Lund University for their hospitality. This work made use of the Simbad database at CDS, Strasbourg.
© European Southern Observatory (ESO) 2000
Online publication: December 17, 1999