We are grateful to S. Sergeev for SPE code for spectra analysis, to Ch. Cowley for numerous consultations and for sending us the rare earth element data, to M. Ya. Orlow for discussing our work, to D. Bord and Ja. Sugar for suggestions and facilities to use their data. The data from Kurucz's CDROM 23, ADC NASA, VALD, NIST, were used and we thank the administrations of these databases, obtainable through INTERNET.
© European Southern Observatory (ESO) 2000
Online publication: June 5, 2000