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Whole Earth Telescope observations of the DBV white dwarf GD 358

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Whole Earth Telescope observations of the DBV white dwarf GD 358

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Título Whole Earth Telescope observations of the DBV white dwarf GD 358
Autor Winget, Donald Earl
Nather, R. Edward
Clemens, J. Christopher
Provencal, Judith L.
Kleinman, Scot James
Bradley, Paul A.
Claver, C.F.
Dixson, James S.
Montgomery, Michael Houston
Hansen, Carl J.
Hine, B.P.
Birch, P.
Candy, M.
Marar, T.M. Krishnan
Seetha, S.
Ashoka, B.N.
Leibowitz, Elia M.
O'Donoghue, Darragh
Warner, B.
Buckley, David A.H.
Tripe, P.
Vauclair, Gérard
Dolez, Noël
Chevreton, Michel
Serre, T.
Garrido, R.
Kepler, Souza Oliveira
Kanaan Neto, Antonio Nemer
Augusteijn, T.
Wood, Matthew A.
Bergeron, Pierre
Grauer, Albert D.
Abstract We report on the analysis of 154 hours of early continuous high-speed photometry on the pulsating DB white dwarf (DBV) GD 358, obtained during the Whole Earth Telescope (WET) run of 1990 May. The power spectrum of the light curve is dominated by power in the range from 1000 to 2400 μHz, with more than 180 significant peaks in the total spectrum. We identify ali of the triplet frequencies as degree l = 1, and from the details of their spacings we derive the total stellar mass as 0.61 ± 0.03 Mʘ , the mass of the outer helium envelope as 2.0 ± 1.0 x 10-6 M*, the absolute luminosity as 0.050 ± 0.012 Lʘ and the distance as 42 ± 3 pc. We find strong evidence for differential rotation in the radial direction−the outer envelope is rotating at least 1.8 times faster than the core−and we detect the presence of a weak magnetic field with a strength of 1300 ± 300 G. We also find a significant power at the sums and differences of the dominant frequencies, indi­ cating nonlinear processes are significant, but they have a richness and complexity that rules out resonant mode coupling as a major cause.
Contido em The astrophysical journal. Chicago. Vol. 430, no. 2, pt. 1 (Aug. 1994), p. 839-849
Assunto Anãs brancas
Astrofisica estelar
Estrelas variaveis
Fotometria estelar
Observações astronômicas no visível
Pulsacoes estelares
[en] Stars: individual (GD 358)
[en] Stars: oscillations
[en] White dwarfs
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/108838
Arquivos Descrição Formato
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