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17th European White Dwarf Workshop: Effect of Radiative Levitation on Calculations of Accretion Rates in White Dwarfs
Chayer, Pierre (2010)
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Chayer P. "17th European White Dwarf Workshop: Effect of Radiative Levitation on Calculations of Accretion Rates in White Dwarfs.", timms video, Universität Tübingen (2010): https://timms.uni-tuebingen.de:443/tp/UT_20100819_014_eurowd_0001. Accessed 30 Oct 2020.
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Chayer, P. (2010). 17th European White Dwarf Workshop: Effect of Radiative Levitation on Calculations of Accretion Rates in White Dwarfs. timms video: Universität Tübingen. Retrieved October 30, 2020 from the World Wide Web https://timms.uni-tuebingen.de:443/tp/UT_20100819_014_eurowd_0001
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Chayer, P. (2010). 17th European White Dwarf Workshop: Effect of Radiative Levitation on Calculations of Accretion Rates in White Dwarfs [Online video]. 19 August. Available at: https://timms.uni-tuebingen.de:443/tp/UT_20100819_014_eurowd_0001 (Accessed: 30 October 2020).
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title: 17th European White Dwarf Workshop: Effect of Radiative Levitation on Calculations of Accretion Rates in White Dwarfs
alt. title: 17th European White Dwarf Workshop - Physical processes in white dwarfs and magnetic white dwarfs
creator: Chayer, Pierre (author)
subjects: Astronomie, Physik, Astrophysik, Workshop, White Dwarf, Radiative Levitation, Calculations of Accretion Rates, Pierre Chayer
description: 17th European White Dwarf Workshop, 16. bis 20. August 2010
abstract: Effect of Radiative Levitation on Calculations of Accretion Rates in White Dwarfs (Pierre Chayer and Jean Dupuis) (Space Telescope Science Institute, Canadian Space Agency) Elements heavier than hydrogen or helium that are present in the atmospheres of white dwarfs with Teff equal or less than 25,000 K are believed to be the result of accretion. By measuring abundances in such white dwarfs and by assuming a steady state accretion, we can derive the composition of the accreted matter and infer its source. The presence of radiative levitation, however, may affect the determination of the accretion rate. We present time-dependent diffusion calculations that take into account radiative levitation and accretion. The calculations are performed on C, N, O, Ne, Na, Mg, Al, Si, S, Ar, and Ca in hydrogen-rich white dwarf models with Teff equal or less than 25,000 K and a gravity of log g = 8.0. In presence of a weak accretion, we show that the abundance of an element supported by the radiative levitation is given by the equilibrium between the radiative and gravitational accelerations. In that case, the prediction of the accretion rate from the observed abundance under the assumption of a steady state accretion may be overestimated.
publisher: ZDV Universität Tübingen
contributor: ZDV Universität Tübingen (producer)
creation date: 2010-08-19
dc type: image
localtype: video
identifier: UT_20100819_014_eurowd_0001
language: eng
rights: Url: https://timmsstatic.uni-tuebingen.de/jtimms/TimmsDisclaimer.html?637396149162839321