We thank Markus Blietz and Alfred Krabbe for their kind assistance with the FAST observations. The William Herschel Telescope was operated by the Royal Greenwich Observatory in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. The research of P.P. van der Werf has been made possible by a fellowship of the Royal Netherlands Academy of Arts and Sciences.
© European Southern Observatory (ESO) 1998
Online publication: July 20, 1998