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The everchanging pulsating white dwarf GD358

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The everchanging pulsating white dwarf GD358

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Título The everchanging pulsating white dwarf GD358
Autor Kepler, Souza Oliveira
Nather, R. Edward
Winget, Donald Earl
Nitta, Atsuko
Kleinman, Scot James
Metcalfe, Travis S.
Sekiguchi, Kazuhiro
Jiang, Xiaojun
Sullivan, Denis J.
Sullivan, Terry
Janulis, Rimvydas
Meistas, Edmundas G.
Kalytis, Romualdas
Krzesinski, Jerzy
Ogloza, Waldemar
Zola, Staszek
O'Donoghue, Darragh
Romero-Colmenero, Encarni
Martinez, Peter
Dreizler, Stefan
Deetjen, Jochen L.
Nagel, Thorsten
Schuh, Sonja L.
Vauclair, Gérard
Fu, Jianning Ning
Chevreton, Michel
Solheim, Jan-Eric
Gonzalez Perez, Jose Miguel
Johannessen, F.
Kanaan Neto, Antonio Nemer
Costa, Jose Eduardo da Silveira
Costa, Alex Fabiano Murillo da
Wood, Matthew A.
Silvestri, Nicole M.
Ahrens, T.J.
Jones, Aaron Kyle
Collins, A.E.
Boyer, M.
Shaw, James Scott
Mukadam, Anjum Shagufta
Klumpe, Eric W.
Larrison, Jesse
Kawaler, Steven D.
Riddle, Reed L.
Ulla, Ana
Bradley, Paul A.
Abstract We report 323 hours of nearly uninterrupted time series photometric observations of the DBV star GD 358 acquired with the Whole Earth Telescope (WET) during May 23rd to June 8th, 2000. We acquired more than 232 000 independent measurements. We also report on 48 hours of time-series photometric observations in Aug 1996. We detected the non-radial g-modes consistent with degree l = 1 and radial order 8 to 20 and their linear combinations up to 6th order. We also detect, for the first time, a high amplitude l = 2 mode, with a period of 796 s. In the 2000 WET data, the largest amplitude modes are similar to those detected with the WET observations of 1990 and 1994, but the highest combination order previously detected was 4th order. At one point during the 1996 observations, most of the pulsation energy was transferred into the radial order k = 8 mode, which displayed a sinusoidal pulse shape in spite of the large amplitude. The multiplet structure of the individual modes changes from year to year, and during the 2000 observations only the k = 9 mode displays clear normal triplet structure. Even though the pulsation amplitudes change on timescales of days and years, the eigenfrequencies remain essentially the same, showing the stellar structure is not changing on any dynamical timescale.
Contido em Astronomy and astrophysics. Berlin. Vol. 401, no. 2 (Apr. 2003), p. 639-654
Assunto Estrelas variaveis
Fotometria estelar
Pulsacoes estelares
[en] Stars: evolution
[en] Stars: individual: GD 358
[en] Stars: oscillations
[en] Stars: variables: general
[en] Stars: white dwarfs
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/109133
Arquivos Descrição Formato
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