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Astron. Astrophys. 334, 618-632 (1998)

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We thank Klaus Werner for his continuous support throughout the entire project.

We would also like to thank Jeff Kruk (Baltimore) for providing the HUT spectrum of PG 1159-035, Thomas Rauch for obtaining the optical MCT 0130-1937 spectrum as well as Stefan Haas (Bamberg) who obtained the IUE spectrum of PG 2131 [FORMULA] 066. Many thanks go also to Steven Kawaler and Sean O'Brien (Iowa) who provided their evolutionary tracks prior to publication.

The enormous amount of computing time made available by the Rechenzentrum der Universität Kiel is gratefully acknowledged.

S. Dreizler was supported by the DFG under grant He 1356/16-2. Several travel grants of the DFG to the Calar Alto observatory are acknowledged. HST data analysis in Bamberg and Tübingen is supported by the DLR under grants 50 OR 96029 and 50 OR 97055.

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© European Southern Observatory (ESO) 1998

Online publication: May 15, 1998