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Preprint 11c/12

HST/COS Spectroscopy of Hydrogen-Deficient Post-AGB Stars: Clues on the Nature of O(He)-Type Stars

N.Reindl (1), 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, Sand 1, 72076 Tübingen
(2) NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA

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

Abstract. O(He) stars are unique amongst the hottest post-AGB stars because their atmospheres are composed of almost pure helium. We present a spectral analysis of HST/COS UV observations by means of NLTE model-atmosphere techniques and discuss their status in the hydrogen-deficient post-AGB evolutionary sequence and in the double-degenerate merger scenario.
 

Preprint (121 kb PDF file including figures)

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