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Preprint 07a/02

Metal abundances in PG1159 stars from Chandra and FUSE spectroscopy

K. WERNER (1), J.L. DEETJEN (1), S. DREIZLER (1), T. RAUCH (2,1), M.A. BARSTOW (3), J.W. KRUK (4)

(1) Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Sand 1, D-72076 Tübingen, Germany
(2) Dr. Remeis-Sternwarte, Universität Erlangen-Nürnberg
(3) University of Leicester, UK
(4) Johns Hopkins University, USA

To appear in: 13th European Workshop on White Dwarfs, NATO Science Series

Abstract. We investigate FUSE spectra of three PG1159 stars and do not find any evidence for iron lines. From a comparison with NLTE models we conclude a deficiency of 1-1.5 dex. We speculate that iron was transformed into heavier elements. A soft X-ray Chandra spectrum of the unique H- and He-deficient star H1504+65 is analyzed. We find high neon and magnesium abundances and confirm that H1504+65 is the bare core of either a C-O or a O-Ne-Mg white dwarf.

Key words: -

Paper (69k gzip'ed Postscript including figures)

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