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Preprint 10a/00

Hot DO white dwarfs: The EUVE spectrum of RE 0503-289 and FUSE observations of HS 0713+3958

Klaus Werner (1), Jochen L. Deetjen (1), Thomas Rauch (1), Burkhard Wolff (2)

(1) Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Waldhäuser Str. 64, D-72076 Tübingen, Germany
(2) Institut für Theoretische Physik und Astrophysik, Univ. Kiel, Germany

To appear in: The 12^th European Workshop on White Dwarfs, ASP Conference Series, Vol. xxx, 2001, H.L. Shipman and J.L. Provencal, eds.

Abstract. A new attempt is made to explain the EUV spectrum of the hot DO white dwarf RE 0503-289. The inclusion of metals in the model atmospheres does not provide enough opacity to fit the observed EUV flux level. This can only be achieved by reducing T_eff to 65000 K. This, however, is in contradiction to optical and UV data which suggest T_eff=70000 K. It is also shown that further progress in detailed EUV spectral fitting is not possible because of the lack of precise atomic data for iron group elements.
We present first FUSE observations of the hot white dwarf DO HS 0713+3958, which shows signatures of an extremely hot and fast wind in UV/optical spectra. Photospheric lines cannot be identified.

Key words: -

Paper (189k gzip'ed Postscript including figures)

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