Affiliation: | aI.A.S., Université Paris-Sud, Bât. 121, F-91405 Orsay Cedex, France bL.A.T., Observatoire Midi-Pyrénées, 14 av. Edouard Belin, F-31400 Toulouse, France cInstitute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA dCaltech-Astronomy, MC 105-24, Pasadena, CA 91125, USA eDepartment of Physics, University of Durham, South Road, Durham DH1 3LE, UK |