Astron. Astrophys. 323, 469-487 (1997)

Acknowledgements

The authors want to thank Henny Lamers, Christoffel Waelkens, René Oudmaijer, Hans van Winckel, Guillermo Gonzalez, Xander Tielens, John Mathis, and David Lambert for the stimulating and constructive discussions on this work. The significant contributions to this work by Jurien Veenhuis are very much appreciated. EJB (in the Netherlands) was supported by grant no. 782-371-040 by ASTRON, which receives funds from the Netherlands Organization for the Advancement of Pure Research (NWO), and (in the USA) in part by the National Science Foundation (Grant No. AST-9315124). LBFMW acknowledges financial support from the Royal Dutch Academy of Arts and Sciences. EvD is grateful to NWO for support through a PIONIER grant. This research has made use of the Simbad database, operated at CDS, Strasbourg, France.

© European Southern Observatory (ESO) 1997

Online publication: June 5, 1998

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