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The everchanging pulsating white dwarf GD358
Kepler, SO; Nather, RE; Winget, DE; Nitta, A; Kleinman, SJ; Metcalfe, T; Sekiguchi, K; Jiang, XJ; Sullivan, D; Sullivan, T; Janulis, R; Meistas, E; Kalytis, R; Krzesinski, J; Ogloza, W; Zola, S; O'Donoghue, D; Romero-Colmenero, E; Martinez, P; Dreizler, S; Deetjen, J; Nagel, T; Schuh, SL; Vauclair, G; Ning, FJ; Chevreton, M; Solheim, JE; Perez, JMG; Johannessen, F; Kanaan, A; Costa, JE; Costa, AFM; Wood, MA; Silvestri, N; Ahrens, TJ; Jones, AK; Collins, AE; Boyer, M; Shaw, JS; Mukadam, A; Klumpe, EW; Larrison, J; Kawaler, S; Riddle, R; Ulla, A; Bradley, P
AbstractWe 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.
KeywordStars : White Dwarfs Stars : Variables : General Stars : Oscillations Stars : Individual : Gd 358 Stars : Evolution
Indexed BySCI
WOS IDWOS:000181708800026
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Cited Times:51[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.UFRGS, Inst Fis, Porto Alegre, RS, Brazil
2.Univ Texas, Dept Astron, Austin, TX 78712 USA
3.Univ Texas, McDonald Observ, Austin, TX 78712 USA
4.Apache Pt Observ, Sloan Digital Sky Survey, Sunspot, NM 88349 USA
5.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
6.Acad Sinica, Beijing Astron Observ, Beijing 100080, Peoples R China
7.Victoria Univ Wellington, Wellington, New Zealand
8.Inst Theoret Phys & Astron, LT-2600 Vilnius, Lithuania
9.Cracow Pedag Univ, Mt Suhora Observ, PL-30084 Krakow, Poland
10.Jagiellonian Univ, Krakow, Poland
11.S African Astron Observ, ZA-7935 Cape Town, South Africa
12.Univ Tubingen, D-72074 Tubingen, Germany
13.Univ Toulouse 3, Observ Midi Pyrenees, CNRS, UMR5572, F-31400 Toulouse, France
14.Observ Paris, DAEC, F-92195 Meudon, France
15.Inst Fys, N-9037 Tromso, Norway
16.Univ Fed Santa Catarina, Dept Fis, BR-88040900 Florianopolis, SC, Brazil
17.Florida Inst Technol, Dept Phys & Space Sci, Melbourne, FL 32901 USA
18.Florida Inst Technol, SARA Observ, Melbourne, FL 32901 USA
19.Univ Florida, Nucl Sci Ctr 202, Gainesville, FL 32611 USA
20.NASA, Lyndon B Johnson Space Ctr, Houston, TX 77058 USA
21.Univ Minnesota, Dept Phys & Astron, Minneapolis, MN 55455 USA
22.Univ Georgia, Dept Phys & Astron, Athens, GA 30602 USA
23.Middle Tennessee State Univ, Dept Phys & Astron, Murfreesboro, TN 37132 USA
24.Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA
25.Univ Vigo, Dept Fis Aplicada, Fac Ciencias, Vigo 36200, Pontevedra, Spain
26.Los Alamos Natl Lab, Los Alamos, NM 87545 USA
Recommended Citation
GB/T 7714
Kepler, SO,Nather, RE,Winget, DE,et al. The everchanging pulsating white dwarf GD358[J]. ASTRONOMY & ASTROPHYSICS,2003,401(2):639-654.
APA Kepler, SO.,Nather, RE.,Winget, DE.,Nitta, A.,Kleinman, SJ.,...&Bradley, P.(2003).The everchanging pulsating white dwarf GD358.ASTRONOMY & ASTROPHYSICS,401(2),639-654.
MLA Kepler, SO,et al."The everchanging pulsating white dwarf GD358".ASTRONOMY & ASTROPHYSICS 401.2(2003):639-654.
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