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17th European White Dwarf Workshop: The stratification of metals in hot white dwarf atmospheres
Dickinson, Nathan (2010)
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mla
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Dickinson N. "17th European White Dwarf Workshop: The stratification of metals in hot white dwarf atmospheres.", timms video, Universität Tübingen (2010): https://timms.uni-tuebingen.de:443/tp/UT_20100819_015_eurowd_0001. Accessed 30 Oct 2020.
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Dickinson, N. (2010). 17th European White Dwarf Workshop: The stratification of metals in hot white dwarf atmospheres. timms video: Universität Tübingen. Retrieved October 30, 2020 from the World Wide Web https://timms.uni-tuebingen.de:443/tp/UT_20100819_015_eurowd_0001
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Dickinson, N. (2010). 17th European White Dwarf Workshop: The stratification of metals in hot white dwarf atmospheres [Online video]. 19 August. Available at: https://timms.uni-tuebingen.de:443/tp/UT_20100819_015_eurowd_0001 (Accessed: 30 October 2020).
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title: 17th European White Dwarf Workshop: The stratification of metals in hot white dwarf atmospheres
alt. title: 17th European White Dwarf Workshop - Physical processes in white dwarfs and magnetic white dwarfs
creator: Dickinson, Nathan (author)
subjects: Astronomie, Physik, Astrophysik, Workshop, White Dwarf, stratification of metals, hot white dwarf atmospheres, Nathan Dickinson
description: 17th European White Dwarf Workshop, 16. bis 20. August 2010
abstract: The stratification of metals in hot white dwarf atmospheres (N.J. Dickinson1, M.A. Barstow1, Ivan Hubeny2) (1. University of Leicester, 2. Steward Observatory, University of Arizona) Hot white dwarf atmospheres are brimming with metallic elements. While radiative levitation theory predicts which elements will be present, and the theoretical patterns between abundance and temperature are broadly consistent, the quantitative abundance measurements of a given white dwarf do not always reproduce theoretical estimates particularly well, and in some cases the absorption line profiles cannot be reproduced. There is also sometimes a significant difference in elemental abundances between systems of a similar effective temperature and surface gravity. It can therefore be inferred that the local stellar environment or stellar processes play a significant role in the observed metallicity of such white dwarfs. While some white dwarfs have unambiguous signs of external sources of pollution, such as a planetary nebula, circumstellar disks, local ionised ISM or are in binary systems, other white dwarfs show no obvious sign of external sources for their observed metal content. One such system, REJ 1032+532, has previously been found to have its nitrogen only in the upper slab of its atmosphere, explaining the observed line profiles. Here, REJ 1032+532 is re-examined using more up to date versions of modeling software, and without using the simplifying assumptions used in previous work. Results of stratified atmosphere calculations for other hot white dwarfs, including the high effective temperature (110,000K) PG0948+534 are also presented.
publisher: ZDV Universität Tübingen
contributor: ZDV Universität Tübingen (producer)
creation date: 2010-08-19
dc type: image
localtype: video
identifier: UT_20100819_015_eurowd_0001
language: eng
rights: Url: https://timmsstatic.uni-tuebingen.de/jtimms/TimmsDisclaimer.html?637396149098787321