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17th European White Dwarf Workshop: Magnetic Fields on DQ White Dwarfs with Carbon Molecular Lines
Vornanen, Tommi (2010)
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mla
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Vornanen T. "17th European White Dwarf Workshop: Magnetic Fields on DQ White Dwarfs with Carbon Molecular Lines.", timms video, Universität Tübingen (2010): https://timms.uni-tuebingen.de:443/tp/UT_20100816_016_eurowd_0001. Accessed 29 Oct 2020.
apa
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Vornanen, T. (2010). 17th European White Dwarf Workshop: Magnetic Fields on DQ White Dwarfs with Carbon Molecular Lines. timms video: Universität Tübingen. Retrieved October 29, 2020 from the World Wide Web https://timms.uni-tuebingen.de:443/tp/UT_20100816_016_eurowd_0001
harvard
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Vornanen, T. (2010). 17th European White Dwarf Workshop: Magnetic Fields on DQ White Dwarfs with Carbon Molecular Lines [Online video]. 16 August. Available at: https://timms.uni-tuebingen.de:443/tp/UT_20100816_016_eurowd_0001 (Accessed: 29 October 2020).
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title: 17th European White Dwarf Workshop: Magnetic Fields on DQ White Dwarfs with Carbon Molecular Lines
alt. title: 17th European White Dwarf Workshop - White dwarf structure and evolution
creator: Vornanen, Tommi (author)
subjects: Astronomie, Physik, Astrophysik, Workshop, White Dwarf, Magnetic Fields, DQ White Dwarfs, Carbon Molecular Lines, Tommi Vornanen
description: 17th European White Dwarf Workshop, 16. bis 20. August 2010
abstract: Magnetic Fields on DQ White Dwarfs with Carbon Molecular Lines (T. Vornanen1, S. Berdyugina2, A. Berdyugin1, V. Piirola1) (1Department of Physics and Astronomy, University of Turku, Turku, Finland 2Kiepenheuer Institute für Sonnenphysik, Freiburg, Germany) We present results from spectropolarimetric observations of 12 DQ white dwarfs with C2 absorption features obtained with VLT/FORS1 and NOT/ALFOSC. We have found one target that shares the same polarization properties with the only object (G 99-37) known so far to have polarized CH molecular bands. This star, GJ 841B, has a magnetic field strength of 130 T (1.3 MG) and a temperature of 6100 K according to our model that is based on calculations of magnetic dichroism appearing in molecular bands in the presence of a strong magnetic field. Unlike G 99-37, GJ 841B also has polarized C2 features. In addition to GJ 841B only one other white dwarf in our sample shows polarization signatures. WD 1235+422 has strong polarization across the whole visible spectrum varying from 0 to 5 %. The polarization features coupled with the intensity spectrum has lead us to believe that WD 1235+422 is a tame version of a peculiar DQ white dwarf. Further investigations into its nature will perhaps reveal the mystery behind the differences in peculiar and normal DQ white dwarfs.
publisher: ZDV Universität Tübingen
contributor: ZDV Universität Tübingen (producer)
creation date: 2010-08-16
dc type: image
localtype: video
identifier: UT_20100816_016_eurowd_0001
language: eng
rights: Url: https://timmsstatic.uni-tuebingen.de/jtimms/TimmsDisclaimer.html?637395677746688047