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Normal modes and discovery of high-order cross-frequencies in the DBV white dwarf GD 358

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Normal modes and discovery of high-order cross-frequencies in the DBV white dwarf GD 358

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Título Normal modes and discovery of high-order cross-frequencies in the DBV white dwarf GD 358
Autor Vuille, F.
O'Donoghue, Darragh
Buckley, David A.H.
Massacand, C.N.
Solheim, Jan-Eric
Bard, S.
Vauclair, Gérard
Giovannini Junior, Odilon
Kepler, Souza Oliveira
Kanaan Neto, Antonio Nemer
Provencal, Judith L.
Wood, Matthew A.
Clemens, J. Christopher
Kleinman, Scot James
O'Brien, M. Sean
Nather, R. Edward
Winget, Donald Earl
Nitta, Atsuko
Klumpe, Eric W.
Montgomery, Michael Houston
Watson, Todd K.
Bradley, Paul A.
Sullivan, Denis J.
Wu, K.
Marar, T.M. Krishnan
Seetha, S.
Ashoka, B.N.
Mahra, H.S.
Bhat, B.C.
Babu, V.C.
Leibowitz, Elia M.
Hemar, Shirley
Ibbetson, Peter A.
Mashal, E.
Meistas, Edmundas G.
Moskalik, Pawel
Zola, Staszek
Krzesinski, Jerzy
Pajdosz, Gabriel
Abstract We present a detailed mode identification performed on the 1994 Whole Earth Telescope (WET) run on GD 358. The results are compared with that obtained for the same star from the 1990 WET data. The two temporal spectra show very few qualitative differences, although amplitude changes are seen in most modes, including the disappearance of the mode identified as k = 14 in the 1990 data. The excellent coverage and signal-to-noise ratio obtained during the 1994 run lead to the secure identification of combination frequencies up to fourth order, i.e. peaks that are sums or differences of up to four parent frequencies, including a virtually complete set of second-order frequencies, as expected from harmonic distortion. We show how the third-order frequencies are expected to affect the triplet structure of the normal modes by back-interacting with them. Finally, a search for l =ˆ 2 modes was unsuccessful, not verifying the suspicion that such modes had been uncovered in the 1990 data set.
Contido em Monthly notices of the Royal Astronomical Society. Oxford. Vol. 314, no. 4 (June 2000), p. 689-701
Assunto Anãs brancas
Estrelas variaveis
Pulsacoes estelares
[en] Stars: individual: GD 358
[en] Stars: variables: other
[en] White dwarfs
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/88769
Arquivos Descrição Formato
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