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17th European White Dwarf Workshop: HST/COS Observations of O(He) Stars
Rauch, Thomas (2010)
clipboard
mla
clipboard		 Rauch T. "17th European White Dwarf Workshop: HST/COS Observations of O(He) Stars.", timms video, Universität Tübingen (2010): https://timms.uni-tuebingen.de:443/tp/UT_20100817_014_eurowd_0001. Accessed 27 Apr 2024.
apa
clipboard		 Rauch, T. (2010). 17th European White Dwarf Workshop: HST/COS Observations of O(He) Stars. timms video: Universität Tübingen. Retrieved April 27, 2024 from the World Wide Web https://timms.uni-tuebingen.de:443/tp/UT_20100817_014_eurowd_0001
harvard
clipboard		 Rauch, T. (2010). 17th European White Dwarf Workshop: HST/COS Observations of O(He) Stars [Online video]. 17 August. Available at: https://timms.uni-tuebingen.de:443/tp/UT_20100817_014_eurowd_0001 (Accessed: 27 April 2024).
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title: 17th European White Dwarf Workshop: HST/COS Observations of O(He) Stars
alt. title: 17th European White Dwarf Workshop - Central stars of planetary nebulae
creator: Rauch, Thomas (author)
subjects: Astronomie, Physik, Astrophysik, Workshop, White Dwarf, HST/COS Observations, O(He) Stars, Thomas Rauch
description: 17th European White Dwarf Workshop, 16. bis 20. August 2010
abstract: HST/COS Observations of O(He) Stars (T. Rauch, K. Werner) (Institute for Astronomy and Astrophysics, Kepler Center for Astro and Particle Physics, Eberhard Karls University, Tübingen, Germany) The four known O(He) stars are the only amongst the hottest post-AGB stars (Teff greater than 100,000 K) whose atmospheres are composed of almost pure helium. This chemistry markedly differs from that of the hydrogendeficient post-AGB evolutionary sequence with objects that have carbon-dominated atmospheres (namely PG1159 stars and Wolf-Rayet type central stars). While PG1159 and Wolf-Rayet stars are the result of a (very) late helium-shell flash, this scenario cannot explain the O(He) stars. Instead, they are possibly double-degenerate mergers. We speculate that the four O(He) stars represent evolved RCrB stars, which also have helium-dominated atmospheres. We present UV spectroscopy of the O(He) stars based on recently performed HST/COS observations.
publisher: ZDV Universität Tübingen
contributor: ZDV Universität Tübingen (producer)
creation date: 2010-08-17
dc type: image
localtype: video
identifier: UT_20100817_014_eurowd_0001
language: eng
rights: Url: https://timmsstatic.uni-tuebingen.de/jtimms/TimmsDisclaimer.html?638497959530939851