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17th European White Dwarf Workshop: The DBV White Dwarf EC20058-5234 - the continuing story
Sullivan, Denis (2010)
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mla
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Sullivan D. "17th European White Dwarf Workshop: The DBV White Dwarf EC20058-5234 - the continuing story.", timms video, Universität Tübingen (2010): https://timms.uni-tuebingen.de:443/tp/UT_20100820_012_eurowd_0001. Accessed 29 Oct 2020.
apa
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Sullivan, D. (2010). 17th European White Dwarf Workshop: The DBV White Dwarf EC20058-5234 - the continuing story. timms video: Universität Tübingen. Retrieved October 29, 2020 from the World Wide Web https://timms.uni-tuebingen.de:443/tp/UT_20100820_012_eurowd_0001
harvard
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Sullivan, D. (2010). 17th European White Dwarf Workshop: The DBV White Dwarf EC20058-5234 - the continuing story [Online video]. 20 August. Available at: https://timms.uni-tuebingen.de:443/tp/UT_20100820_012_eurowd_0001 (Accessed: 29 October 2020).
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title: 17th European White Dwarf Workshop: The DBV White Dwarf EC20058-5234 - the continuing story
alt. title: 17th European White Dwarf Workshop - Pulsating white dwarfs
creator: Sullivan, Denis (author)
subjects: Astronomie, Physik, Astrophysik, Workshop, White Dwarf, DBV White Dwarf EC20058-5234, Denis Sullivan
description: 17th European White Dwarf Workshop, 16. bis 20. August 2010
abstract: The DBV White Dwarf EC20058-5234: the continuing story (Denis J Sullivan) (School of Chemical and Physical Sciences, Victoria University of Wellington New Zealand) The helium atmosphere pulsator, EC20058-5234 currently defines the hot edge of the DBV instability strip. Its effective temperature, estimated by both spectroscopic and asteroseismic techniques, is consistent with an extremely hot core in which models predict a neutrino cooling flux, created primarily by the plasmon decay process, exceeds the surface photon flux. Although EC20058 is multiperiodic, it has been shown to be a very stable pulsator with two dominant modes. Contraction of the white dwarf has largely ceased in the DBV instability strip temperature regime, so the decreasing temperature due to cooling should lead to very small increases in the pulsation periods provided no other effects such as resonant mode trapping occur. Beginning with a Whole Earth Telescope run in 1997, we have regularly obtained seasonal data on EC20058 (largely at Mt John observatory in NZ) in an effort to determine a Pdot for its pulsation modes and connect this to the the theoretical neutrino cooling mechanism. This paper will report on our success to date.
publisher: ZDV Universität Tübingen
contributor: ZDV Universität Tübingen (producer)
creation date: 2010-08-20
dc type: image
localtype: video
identifier: UT_20100820_012_eurowd_0001
language: eng
rights: Url: https://timmsstatic.uni-tuebingen.de/jtimms/TimmsDisclaimer.html?637395701308810429