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High precision with the Whole Earth Telescope: Lessons and some results from XCoV20 for the roAp star HR 1217
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, A; Nather, RE; Winget, DE; Sullivan, DJ; Sullivan, T; Sekiguchi, K; Jiang, XJ; Shobbrook, RR; Birch, PV; Ashoka, BN; Seetha, S; Joshi, S; Girish, V; 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; Cameron, C; Vauclair, G; Nitta, A; Kleinman, SJ
Source PublicationBALTIC ASTRONOMY
AbstractHR 1217 is a prototypical rapidly oscillating Ap star that has presented a test to the theory of nonradial stellar pulsation. Prior observations showed a clear pattern of five modes with alternating frequency spacings of 33.3 muHz 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 (2001) 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. The 20th extended coverage campaign of the Whole Earth Telescope (XCov20) has discovered this frequency as predicted by Cunha (2001). Amplitude modulation of several of the pulsation modes between the 1986 and 2000 data sets has also been discovered, while important parameters for modelling the geometry of the pulsation modes have been shown to be unchanged. With stringent selection of the best data from the WET network the amplitude spectrum shows highest peaks at only 50 mumag and formal errors on the determined amplitudes are 14 mumag. Some lessons for future use of WET for the highest precision photometry on bright stars are discussed.
KeywordStars : Roap Stars Stars : Individual : Hr 1217
Indexed ByISTP ; SCI
WOS IDWOS:000184698800011
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Document Type期刊论文
Affiliation1.Univ Cent Lancashire, Ctr Astrophys, Preston PR1 2HE, Lancs, England
2.Observ Midi Pyrenees, CNRS, UMR5572, F-31400 Toulouse, France
3.Univ Cape Town, Dept Astron, ZA-7701 Rondebosch, South Africa
4.Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA
5.Univ Porto, Ctr Astrofis, P-4150762 Oporto, Portugal
6.Inst Super Maia, P-4470 Castela Da Maia, Portugal
7.Florida Inst Technol, Dept Phys & Space Sci, Melbourne, FL USA
8.Florida Inst Technol, SARA Observ, Melbourne, FL USA
9.Georgetown Univ SW, Georgetown, TX USA
10.Nicholas Copernicus Astron Ctr, PL-00716 Warsaw, Poland
11.Krakow Pedagog Univ, 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, New Zealand
16.Natl Astron Observ Japan, Subaru Observ, 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.Perth Observ, Bickley, WA 6076, Australia
21.Indian Space Res Org, Bangalore 560017, Karnataka, India
22.State Observ, Naini Tal 263129, India
23.S African Astron Observ, ZA-7935 Cape Town, South Africa
24.Univ Tromso, Dept Phys, N-9037 Tromso, Norway
25.Univ Vigo, Dept Fis Aplicada, Vigo 36200, Spain
26.UFRGS, Inst Fis, BR-15051 Porto Alegre, RS, Brazil
27.Univ Fed Santa Catarina, Florianopolis, SC, Brazil
28.Univ Caxias Do Sul, Dept Quim & Fis, BR-95001970 Caxias Do Sul, RS, Brazil
29.Univ British Columbia, Dept Phys & Astron, Vancouver, BC V5Z 1M9, Canada
30.Apache Point Observ, Sunspot, NM 88349 USA
Recommended Citation
GB/T 7714
Kurtz, DW,Kawaler, SD,Riddle, RL,et al. High precision with the Whole Earth Telescope: Lessons and some results from XCoV20 for the roAp star HR 1217[J]. BALTIC ASTRONOMY,2003,12(1):105-117.
APA Kurtz, DW.,Kawaler, SD.,Riddle, RL.,Reed, MD.,Cunha, MS.,...&Kleinman, SJ.(2003).High precision with the Whole Earth Telescope: Lessons and some results from XCoV20 for the roAp star HR 1217.BALTIC ASTRONOMY,12(1),105-117.
MLA Kurtz, DW,et al."High precision with the Whole Earth Telescope: Lessons and some results from XCoV20 for the roAp star HR 1217".BALTIC ASTRONOMY 12.1(2003):105-117.
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