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17th European White Dwarf Workshop: The ultra-massive fast-spinning white dwarf companion of HD 49798
Mereghetti, Sandro (2010)
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mla
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Mereghetti S. "17th European White Dwarf Workshop: The ultra-massive fast-spinning white dwarf companion of HD 49798.", timms video, Universität Tübingen (2010): https://timms.uni-tuebingen.de:443/tp/UT_20100818_004_eurowd_0001. Accessed 29 Oct 2020.
apa
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Mereghetti, S. (2010). 17th European White Dwarf Workshop: The ultra-massive fast-spinning white dwarf companion of HD 49798. timms video: Universität Tübingen. Retrieved October 29, 2020 from the World Wide Web https://timms.uni-tuebingen.de:443/tp/UT_20100818_004_eurowd_0001
harvard
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Mereghetti, S. (2010). 17th European White Dwarf Workshop: The ultra-massive fast-spinning white dwarf companion of HD 49798 [Online video]. 18 August. Available at: https://timms.uni-tuebingen.de:443/tp/UT_20100818_004_eurowd_0001 (Accessed: 29 October 2020).
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title: 17th European White Dwarf Workshop: The ultra-massive fast-spinning white dwarf companion of HD 49798
alt. title: 17th European White Dwarf Workshop - SN progenitors
creator: Mereghetti, Sandro (author)
subjects: Astronomie, Physik, Astrophysik, Workshop, White Dwarf, ultra-massive fast-spinning white dwarf companion, HD 49798, Sandro Mereghetti
description: 17th European White Dwarf Workshop, 16. bis 20. August 2010
abstract: The ultra-massive fast-spinning white dwarf companion of HD 49798 (S. Mereghetti1, A.Tiengo1, P.Esposito1, N.La Palombara1, F. Pizzolato2, L.Stella3, G.L.Israel3) ((1)INAF - IASF Milano, (2) INAF - Osservatorio Astronomico di Brera, (3) INAF - Osservatorio Astronomico di Roma) The existence of ultra-massive white dwarfs (M greater than 1.2 M (Sun)) is of particular interest for several fields, ranging from the physical properties of matter at high density, to the evolution of single and binary stars. Ultramassive white dwarfs are also relevant as likely progenitors of Type Ia supernovae. Using X-ray observations taken with the XMM-Newton satellite, we recently obtained compelling evidence, based only on dynamical measurements, for the presence of a white dwarf with mass 1.28±0.05 M (Sun) in the 1.5 days binary HD49798/RXJ0648-4418. This is a peculiar binary system, composed of a hot sub-dwarf and a fastly rotating white dwarf, resulting from common envelope evolution. The ultra-massive white dwarf is rotating only a factor two slower than break-up and it must have a weak magnetic field in order to accrete. Thus this system is a white dwarf analogue of the X-ray binaries in which weakly magnetic neutron stars are spun-up and then recycled as millisecond radio pulsars. The future evolution of this system might lead to a new phase of high mass transfer causing the already massive white dwarf to exceed the Chandrasekhar limit and explode as a Type Ia supernova.
publisher: ZDV Universität Tübingen
contributor: ZDV Universität Tübingen (producer)
creation date: 2010-08-18
dc type: image
localtype: video
identifier: UT_20100818_004_eurowd_0001
language: eng
rights: Url: https://timmsstatic.uni-tuebingen.de/jtimms/TimmsDisclaimer.html?637395669339213737