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Preprint 01/00

Properties of atmospheres and winds of H-deficient central stars and related objects

K. WERNER

Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Waldhäuser Str. 64, D-72076 Tübingen, Germany

in Low mass Wolf-Rayet stars: Origin and evolution, eds. T. Blöcker, L.B.F.M. Waters, A.A. Zijlstra, Astrophysics and Space Science, in press

Abstract. According to latest results presented at this workshop, it appears that the surface chemistry of hydrogen-deficient post-AGB stars can now be explained by evolutionary calculations involving a late He-shell flash. A quantitative comparison of theoretical predictions with observed element abundances can eventually constrain details of this evolutionary scenario. I will emphasize here the diverse chemical compositions observed in H-deficient post-AGB stars, which call for an explanation. The abundance patterns vary from almost pure helium atmospheres to hydrogen- and helium-free atmospheres, with a rich choice of compositions in between, involving rather different mixtures of H, He, and CNO.

Key words: -

Paper (298k gzip'ed Postscript including figures)

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