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Preprint 10g/00

High resolution Keck and NTT spectra of PG 1159 stars

S. Köper (1), T. Rauch (1), S. Dreizler (1), U. Heber (2), I.N. Reid (3), K. Werner (1)

(1) Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Waldhäuser Str. 64, D-72076 Tübingen, Germany
(2) Sternwarte Bamberg, Germany
(3) University of Pennsylvania, USA

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. We present high-resolution spectra of PG 1159 stars obtained at the Keck and NTT telescopes. They are compared to NLTE model fluxes in order to investigate the possibility to determine rotational velocities. The high-quality data reveal deficiencies in the model atmospheres and in our knowledge of atomic energy levels. These presently hamper the data analysis. The fast rotation of NGC 246 is confirmed. There are hints that rotational velocities in three luminous hybrid-PG 1159 stars are of the order v_rot·sin i = 40 km s^-1. The slow rotation of PG ,1159-035, previously derived by asteroseismology, is corroborated.

Key words: -

Paper (145k gzip'ed Postscript including figures)

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