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Preprint 05/96

New Results on PG 1159 Stars and ultrahigh-excitation DO White Dwarfs

K. Werner(1), S. Dreizler(2), U. Heber(3), T. Rauch(4)

(1)Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Waldhäuser Str. 64, D-72076 Tübingen, Germany
(2)Institut für Astronomie und Astrophysik, Universität Kiel, Germany
(3)Dr. Remeis-Sternwarte, Bamberg, Germany
(4)Lehrstuhl Astrophysik, Universität Potsdam, Germany

to appear in the proceedings of the 10th European Workshop - White Dwarfs, Blanes, Spain, June 17-21, 1996

Abstract. We address four topics describing our latest progress since the last white dwarf workshop. 1. We report on new HST UV spectra of selected PG 1159 stars which were taken for fine analyses to constrain the GW Vir instability strip. 2. We describe the results of an analysis of a new ROSAT detected PG 1159 star which turns out to be the hottest known object of this spectral type. 3. Latest HST observations of the so-called ultra-high ionization white dwarfs give surprising insights into the 'O VIII' phenomenon. 4. Finally we report on results of a recent effort to search for faint nebulae around hot white dwarfs.

Paper (69k gzip'ed Postscript including figures)

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Jürgen Barnstedt (barnstedt AT astro.uni-tuebingen.de)
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