We thank H.E. Schwarz for providing the observing time at the Dutch 91 cm, thereby giving this project a good start. R. Weinberger is thanked for the observations at the 3.6 m and helpful discussions. The torus fitting procedure owes a lot to H. Gratl. We gratefully acknowledge the financial support by the "Fonds zur Förderung der wissenschaftlichen Forschung"; project P10279-AST and a travel grant from the Austrian "Bundesministerium für Wissenschaft, Forschung und Kunst". This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France.
© European Southern Observatory (ESO) 1997
Online publication: July 8, 1998