The Jacobus Kapteyn Telescope is operated on the island of La Palma by the Royal Greenwich Observatory at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. The authors would like to thank the referee Olivier Hainaut for his constructive comments and suggestions for the first draft of this paper. Financial assistance from DENI is gratefully acknowledged.
© European Southern Observatory (ESO) 1999
Online publication: September 2, 1999