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17th European White Dwarf Workshop: Applying the accretion-diffusion model to a sample of DAZ without IR excess
Dupuis, Jean (2010)
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Dupuis J. "17th European White Dwarf Workshop: Applying the accretion-diffusion model to a sample of DAZ without IR excess.", timms video, Universität Tübingen (2010): https://timms.uni-tuebingen.de:443/tp/UT_20100819_016_eurowd_0001. Accessed 30 Oct 2020.
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Dupuis, J. (2010). 17th European White Dwarf Workshop: Applying the accretion-diffusion model to a sample of DAZ without IR excess. timms video: Universität Tübingen. Retrieved October 30, 2020 from the World Wide Web https://timms.uni-tuebingen.de:443/tp/UT_20100819_016_eurowd_0001
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Dupuis, J. (2010). 17th European White Dwarf Workshop: Applying the accretion-diffusion model to a sample of DAZ without IR excess [Online video]. 19 August. Available at: https://timms.uni-tuebingen.de:443/tp/UT_20100819_016_eurowd_0001 (Accessed: 30 October 2020).
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title: 17th European White Dwarf Workshop: Applying the accretion-diffusion model to a sample of DAZ without IR excess
alt. title: 17th European White Dwarf Workshop - Physical processes in white dwarfs and magnetic white dwarfs
creator: Dupuis, Jean (author)
subjects: Astronomie, Physik, Astrophysik, Workshop, White Dwarf, accretion-diffusion model, sample of DAZ without IR excess, Jean Dupuis
description: 17th European White Dwarf Workshop, 16. bis 20. August 2010
abstract: Applying the accretion-diffusion model to a sample of DAZ without IR excess (Jean Dupuis, Pierre Chayer and Vincent Hénault-Brunet) (Canadian Space Agency, STSCI and University of Edinburgh) We consider a sample of five stars with effective temperatures lower than 25,000 K and showing a range of metallicities. Two stars exhibit a host of metal lines from multiple species and three stars show uniquely faint silicon lines. The most likely origin of metals detected in stars of this type is the accretion of matter from circumstellar material, although none of the objects considered in this study bears the signature of a dust disk frequently detected through IR excess in DAZ. The aim of this paper is to explain the peculiar abundance patterns observed in these stars in terms of the accretion-diffusion model and infer the source of the circumstellar matter. To achieve this, we perform time-dependent diffusion calculations accounting for radiative levitation, which is not entirely negligible for some of the light species (C, Si, and Al).
publisher: ZDV Universität Tübingen
contributor: ZDV Universität Tübingen (producer)
creation date: 2010-08-19
dc type: image
localtype: video
identifier: UT_20100819_016_eurowd_0001
language: eng
rights: Url: https://timmsstatic.uni-tuebingen.de/jtimms/TimmsDisclaimer.html?637396149034775123