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Preprint 11e/12

The Exciting Star of the Planetary Nebula NGC 246

T. Rauch (1), K. Werner (1), J. W. Kruk (2)

(1) Institute for Astronomy and Astrophysics, Kepler Center for Astro and Particle Physics, Eberhard Karls University, Tuebingen, Germany
(2) NASA Goddard Space Flight Center, Greenbelt, MD, USA

To be published in: Proceedings, 18th European White Dwarf Workshop, Krakow, Poland, 13-17 Aug. 2012, ASP Conference Series

Abstract. The central star (WD 0044-121) of the very large planetary nebula (PN) NGC 246 (Skull Nebula, PN G118.8-74.7) is an extremely hot, hydrogen-deficient member of the PG 1159 spectroscopic subtype, within which it is the brightest (mV = 11.78) and one of the most massive (0.74 Msun) stars. It shows non-radial g-mode pulsations, that are typical for GW Vir (= PG 1159-035) variables. We present preliminary results of a state-of-the-art NLTE spectral analysis by means of model-atmosphere techniques that is based on high-resolution and high-S/N (F)UV spectroscopy.

Preprint (158 kb PDF file including figures)

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