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Discovery of the 'missing' mode in HR 1217 by the Whole Earth Telescope
Kurtz, DW; Kawaler, SD; Riddle, RL; Reed, MD; Cunha, MS; Wood, M; Silvestri, N; Watson, TK; Dolez, N; Moskalik, P; Zola, S; Pallier, E; Guzik, JA; Metcalfe, TS; Mukadam, AS; Nather, RE; Winget, DE; Sullivan, DJ; Sullivan, T; Sekiguchi, K; Jiang, X; Shobbrook, R; Ashoka, BN; Seetha, S; Joshi, S; O'Donoghue, D; Handler, G; Mueller, M; Perez, JMG; Solheim, JE; Johannessen, F; Ulla, A; Kepler, SO; Kanaan, A; da Costa, A; Fraga, L; Giovannini, O; Matthews, JM; WET collaboration
AbstractHR 1217 is a prototypical rapidly oscillating Ap star that has presented a test to the theory of non-radial stellar pulsation. Prior observations showed a clear pattern of five modes with alternating frequency spacings of 33.3 and 34.6 muHz, with a sixth mode at a problematic spacing of 50.0 muHz (which equals 1.5 X 33.3 muHz) to the high-frequency side. Asymptotic pulsation theory allowed for a frequency spacing of 34 muHz, but Hipparcos observations rule out such a spacing. Theoretical calculations of magnetoacoustic modes in Ap stars by Cunha predicted that there should be a previously undetected mode 34 muHz higher than the main group, with a smaller spacing between it and the highest one. In this Letter. we present preliminary results from a multisite photometric campaign on the rapidly oscillating Ap star HR 1217 using the 'Whole Earth Telescope'. While a complete analysis of the data will appear in a later paper, one outstanding result from this run is the discovery of a newly detected frequency in the pulsation spectrum of this star. at the frequency predicted by Cunha.
KeywordStars : Individual : Hr 1217 Stars : Magnetic Fields Stars : Oscillations Stars : Variables : Other
Indexed BySCI
WOS IDWOS:000174365200002
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Cited Times:25[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Univ Cent Lancashire, Ctr Astrophys, Preston PR1 2HE, Lancs, England
2.Univ Cape Town, Dept Astron, ZA-7701 Rondebosch, South Africa
3.Observ Midi Pyrenees, CNRS, UMR 5572, F-31400 Toulouse, France
4.Iowa State Univ Sci & Technol, Dept Phys & Astron, Ames, IA 50011 USA
5.Univ Porto, Ctr Astrofis, P-4150762 Oporto, Portugal
6.Inst Super Maia, P-4475690 Avisoso S Pedro, Castelo da Maia, Portugal
7.Florida Inst Technol, Dept Phys & Space Sci, Melbourne, FL 32901 USA
8.Florida Inst Technol, SARA Observ, Melbourne, FL 32901 USA
9.Southwestern Univ, Informat Technol Serv, Georgetown, TX 78626 USA
10.Nicholaus Copernicus Astron Ctr, PL-00716 Warsaw, Poland
11.Pedag Univ ielce, Mt Suhora Observ, PL-30084 Krakow, Poland
12.Los Alamos Natl Lab, Los Alamos, NM 87545 USA
13.Univ Texas, McDonald Observ, Austin, TX 78712 USA
14.Univ Texas, Dept Astron, Austin, TX 78712 USA
15.Victoria Univ Wellington, Sch Chem & Phys Sci, Wellington 6001, New Zealand
16.Natl Astron Observ Japan, Subaru Telescope, Hilo, HI 96720 USA
17.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
18.Chinese Acad Sci, Joint Lab Opt Astron, Beijing 100012, Peoples R China
19.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
20.Indian Space Res Org, Bangalore 560017, Karnataka, India
21.Uttar Pradesh State Observ, Naini Tal 263129, India
22.S African Astron Observ, ZA-7935 Observatory, South Africa
23.Univ Tromso, Dept Phys, N-9037 Tromso, Norway
24.Univ Vigo, Dept Fis Aplicada, Vigo 36200, Spain
25.Univ Fed Rio Grande Sul, Inst Fis, Porto Alegre, RS, Brazil
26.Univ Fed Santa Catarina, Florianopolis, SC, Brazil
27.Univ Caxias do Sul, Dept Quim & Fis, BR-95001970 Caxias Do Sul, RS, Brazil
28.Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada
Recommended Citation
GB/T 7714
Kurtz, DW,Kawaler, SD,Riddle, RL,et al. Discovery of the 'missing' mode in HR 1217 by the Whole Earth Telescope[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2002,330(3):L57-L61.
APA Kurtz, DW.,Kawaler, SD.,Riddle, RL.,Reed, MD.,Cunha, MS.,...&WET collaboration.(2002).Discovery of the 'missing' mode in HR 1217 by the Whole Earth Telescope.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,330(3),L57-L61.
MLA Kurtz, DW,et al."Discovery of the 'missing' mode in HR 1217 by the Whole Earth Telescope".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 330.3(2002):L57-L61.
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