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Whole Earth Telescope observations of V471 Tauri : the nature of the white dwarf variations

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Whole Earth Telescope observations of V471 Tauri : the nature of the white dwarf variations

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Título Whole Earth Telescope observations of V471 Tauri : the nature of the white dwarf variations
Autor Clemens, J. Christopher
Nather, R. Edward
Winget, Donald Earl
Robinson, E.L.
Wood, Matthew A.
Claver, C.F.
Provencal, Judith L.
Kleinman, Scot James
Bradley, Paul A.
Frueh, M.L.
Grauer, Albert D.
Hine, B.P.
Fontaine, Gilles
Achilleos, Nicholas
Wickramasinghe, D.T.
Marar, T.M. Krishnan
Seetha, S.
Ashoka, B.N.
O'Donoghue, Darragh
Warner, B.
Kurtz, Donald W.
Martinez, Peter
Vauclair, Gérard
Chevreton, Michel
Barstow, Martin A.
Kanaan Neto, Antonio Nemer
Kepler, Souza Oliveira
Augusteijn, T.
Paradijs, J. van
Hansen, Carl J.
Abstract We have conducted time-series photometric observations of the binary star V471 Tauri using the Whole Earth Telescope observing network. Our purpose was to determine the mechanism responsible for causing the 555 and 277 s periodic luminosity variations exhibited by the white dwarf in this binary. Previous observers have proposed that either g-mode pulsations or rotation of an accreting magnetic white dwarf could cause the variations, but were unable to decide which was the correct model. Our observations have answered this question. Learning the cause of the white dwarf variations has been possible because of our discovery of a periodic signal at 562 s in the Johnson U-band flux of the binary. By identifying this signal as reprocessed radiation and using its phase to infer the phase of the shorter wavelength radiation which produces it, we have been able to compare the phase of the 555 s U-band variations to the phase of the X-ray variations. We have found that U-band maximum coincides with X-ray minimum. From this result we have concluded that the magnetic rotator model accurately describes the variations we observe, but that models involving g-mode pulsations do not.
Contido em The astrophysical journal. Chicago. Vol. 391, no. 2, pt. 1 (June 1992), p. 773-783
Assunto Acreção
Anãs brancas
Astrofisica estelar
Estrelas variaveis
Fotometria estelar
Radiação estelar
[en] Individual (V471 Tauri)
[en] Stars: oscillations
[en] White dwarfs
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/108731
Arquivos Descrição Formato
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