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Title:
Normal modes and discovery of high-order cross-frequencies in the DBV white dwarf GD 358
Authors:
Vuille, F.; O'Donoghue, D.; Buckley, D. A. H.; Massacand, C.-M.; Solheim, J. E.; Bard, S.; Vauclair, G.; Giovannini, O.; Kepler, S. O.; Kanaan, A.; Provencal, J. L.; Wood, M. A.; Clemens, J. C.; Kleinman, S. J.; O'Brien, M. S.; Nather, R. E.; Winget, D. E.; Nitta, A.; Klumpe, E. W.; Montgomery, M. H.; Watson, T. K.; Bradley, P. A.; Sullivan, D. J.; Wu, K.; Marar, T. M. K.; Seetha, S.; Ashoka, B. N.; Mahra, H. S.; Bhat, B. C.; Babu, V. C.; Leibowitz, E. M.; Hemar, S.; Ibbetson, P.; Mashals, E.; Meištas, E.; Moskalik, P.; Zoła, S.; Krzesiński, J.; Pajdosz, G.
Affiliation:
AA(Department of Astronomy, University of Cape Town, Rondebosch 7700, South Africa), AB(South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa), AC(South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa), AD(MR, Nordlysobservatoriet, Universitetet i Tromso, N-9037 Tromso, Norway), AE(MR, Nordlysobservatoriet, Universitetet i Tromso, N-9037 Tromso, Norway), AF(University of Oslo, Institute of Theoretical Astrophysics, PO Box 1029 - Blindern, N-0315 Oslo, Norway), AG(Observatoire Midi-Pyrenees, 14 Avenue E. Belin, 31400 Toulouse, France), AH(Instituto de Fisica, Universidade Federal do Rio Grande do Sul, 91500-970 Porto Alegre RS, Brazil), AI(Instituto de Fisica, Universidade Federal do Rio Grande do Sul, 91500-970 Porto Alegre RS, Brazil), AJ(Dep. de Fisica - UFSC, Campus Universitario - Trindade, CEP 88040-900 - Florianopolis SC, Brazil), AK(Sharp Laboratory, Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA), AL(Department of Physics and Space Sciences, Florida Institute of Technology, 150 W. University Blvd, Melbourne, FL 32901-6975, USA), AM(Campus Box 3255, 264 Phillips Hall, Chapel Hill, NC 27599, USA), AN(Iowa State University, Department of Physics and Astronomy, Ames, IA 50011, USA), AO(Department of Physics, Grinnell College, PO Box 805, Grinnell, IA 50112-0806, USA), AP(Astronomy Department, University of Texas at Austin, Austin, TX 78712, USA), AQ(Astronomy Department, University of Texas at Austin, Austin, TX 78712, USA), AR(Astronomy Department, University of Texas at Austin, Austin, TX 78712, USA), AS(Astronomy Department, University of Texas at Austin, Austin, TX 78712, USA), AT(Astronomy Department, University of Texas at Austin, Austin, TX 78712, USA; Institute for Astronomy, Türkenschanzstrasse 17, A-1180 Vienna, Austria), AU(Information Technology Services, Southwestern University, Georgetown, TX 78626, USA), AV(XTA, MS B220, Los Alamos National Laboratory, Los Alamos, NM 874545, USA), AW(Department of Physics, Victoria University of Wellington, PO Box 600, Wellington, New Zealand), AX(Research Centre for Theoretical Astrophysics, School of Physics, University of Sydney, NSW 2006, Australia), AY(Technical Physics Divison, ISRO Satellite Centre, Airport Road, Bangalore 560 017, India), AZ(Technical Physics Divison, ISRO Satellite Centre, Airport Road, Bangalore 560 017, India), BA(Technical Physics Divison, ISRO Satellite Centre, Airport Road, Bangalore 560 017, India), BB(Technical Physics Divison, ISRO Satellite Centre, Airport Road, Bangalore 560 017, India), BC(Technical Physics Divison, ISRO Satellite Centre, Airport Road, Bangalore 560 017, India), BD(Technical Physics Divison, ISRO Satellite Centre, Airport Road, Bangalore 560 017, India), BE(University of Tel Aviv, Department of Physics and Astronomy, Ramat Aviv, Tel Aviv 69978, Israel), BF(University of Tel Aviv, Department of Physics and Astronomy, Ramat Aviv, Tel Aviv 69978, Israel), BG(University of Tel Aviv, Department of Physics and Astronomy, Ramat Aviv, Tel Aviv 69978, Israel), BH(University of Tel Aviv, Department of Physics and Astronomy, Ramat Aviv, Tel Aviv 69978, Israel), BI(Institute of Theoretical Physics and Astronomy, Goštauto 12, Vilnius 2600, Lithuania), BJ(Copernicus Astronomical Center, Polish Academy of Sciences, ul. Bartycka 18, 00-716 Warsaw, Poland), BK(Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30-244 Cracow, Poland; Mt Suhora Observatory, Cracow Pedagogical University, ul. Podchorazych 2, 30-084 Cracow, Poland), BL(Mt Suhora Observatory, Cracow Pedagogical University, ul. Podchorazych 2, 30-084 Cracow, Poland), BM(Mt Suhora Observatory, Cracow Pedagogical University, ul. Podchorazych 2, 30-084 Cracow, Poland)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 314, Issue 4, pp. 689-701. (MNRAS Homepage)
Publication Date:
06/2000
Origin:
MNRAS
Astronomy Keywords:
STARS: INDIVIDUAL: GD 358, STARS: VARIABLES: OTHER, WHITE DWARFS
DOI:
10.1046/j.1365-8711.2000.03369.x
Bibliographic Code:
2000MNRAS.314..689V

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=2 modes was unsuccessful, not verifying the suspicion that such modes had been uncovered in the 1990 data set.

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