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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
2006 Whole earth telescope observations of GD358: A new look at the prototype DBV
Astrophysical Journal, Volume 693, No. 1, Year 2009
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Description
We report on the analysis of 436.1 hr of nearly continuous high-speed photometry on the pulsating DB white dwarf GD358 acquired with the Whole Earth Telescope (WET) during the 2006 international observing run, designated XCOV25. The Fourier transform (FT) of the light curve contains power between 1000 and 4000 μHz, with the dominant peak at 1234 μHz. We find 27 independent frequencies distributed in 10 modes, as well as numerous combination frequencies. Our discussion focuses on a new asteroseismological analysis of GD358, incorporating the 2006 data set and drawing on 24 years of archival observations. Our results reveal that, while the general frequency locations of the identified modes are consistent throughout the years, the multiplet structure is complex and cannot be interpreted simply as l = 1 modes in the limit of slow rotation. The high-k multiplets exhibit significant variability in structure, amplitude and frequency. Any identification of the m components for the high-k multiplets is highly suspect. The k = 9 and 8 modes typically do show triplet structure more consistent with theoretical expectations. The frequencies and amplitudes exhibit some variability, but much less than the high-k modes. Analysis of the k = 9 and 8 multiplet splittings from 1990 to 2008 reveal a long-term change in multiplet splittings coinciding with the 1996 sforzando event, where GD358 dramatically altered its pulsation characteristics on a timescale of hours. We explore potential implications, including the possible connections between convection and/or magnetic fields and pulsations. We suggest future investigations, including theoretical investigations of the relationship between magnetic fields, pulsation, growth rates, and convection. © 2009. The American Astronomical Society. All rights reserved..
Authors & Co-Authors
Provençal, Judith L.
United States, Newark
University of Delaware
United States, Greenville
Mt. Cuba Observatory
Montgomery, Michael H.
United States, Greenville
Mt. Cuba Observatory
United States, Austin
The University of Texas at Austin
Kanaan, Antonio
Brazil, Florianopolis
Universidade Federal de Santa Catarina
Shipman, Harry L.
United States, Newark
University of Delaware
Childers, Daniel P.
Unknown Affiliation
Baran, Andrzej S.
Poland, Krakow
Uniwersytet Pedagogiczny Im. Komisji Edukacji Narodowej
Kepler, Souza Oliveira
Brazil, Porto Alegre
Universidade Federal do Rio Grande do Sul
Reed, Michael D.
United States, Springfield
Missouri State University
Zhou, Aiying
United States, Springfield
Missouri State University
Eggen, Joesph R.
United States, Springfield
Missouri State University
Watson, Todd K.
United States, Georgetown
Southwestern University
Winget, Don Earl
United States, Austin
The University of Texas at Austin
Thompson, Susan E.
United States, Newark
University of Delaware
United States, Greenville
Mt. Cuba Observatory
Nitta, Atsuko
United States, Hilo
Gemini Observatory
Kleinman, Scott J.
United States, Hilo
Gemini Observatory
Crowe, Richard A.
United States, Hilo
University of Hawaii at Hilo
Purves, Norman G.
United States, Hilo
University of Hawaii at Hilo
Binder, Philippe M.
United States, Hilo
University of Hawaii at Hilo
Knight, R.
United States, Hilo
University of Hawaii at Hilo
Kim, Seung-lee
South Korea, Daejeon
Korea Astronomy and Space Science Institute
Chen, Wenping
Taiwan, Taoyuan
National Central University
Yang, M.
Taiwan, Taoyuan
National Central University
Lin, Hungchin
Taiwan, Taoyuan
National Central University
Lin, Chiencheng
Taiwan, Taoyuan
National Central University
Chen, Chinwei
Taiwan, Taoyuan
National Central University
Jiang, Xiaojun
China, Beijing
Chinese Academy of Sciences
Sergeev, Aleksandr V.
Ukraine, Kyiv
National Academy of Sciences of Ukraine
Mkrtichian, David E.
Ukraine, Odessa
Odesa I.i. Mechnikov National University
South Korea, Seoul
Sejong University
Andreev, Maksim V.
Ukraine, Kyiv
National Academy of Sciences of Ukraine
Janulis, Rimvydas
Lithuania, Vilnius
Vilniaus Universitetas
Siwak, Michał
Poland, Krakow
Uniwersytet Jagielloński
Zoła, Stanisław
Poland, Krakow
Uniwersytet Pedagogiczny Im. Komisji Edukacji Narodowej
Poland, Krakow
Uniwersytet Jagielloński
Stachowski, Greg
Poland, Krakow
Uniwersytet Pedagogiczny Im. Komisji Edukacji Narodowej
Páparo, Margit
Hungary, Budapest
Konkoly Observatory
Bognár, Zs
Hungary, Budapest
Konkoly Observatory
Handler, Gerald
Austria, Vienna
Universität Wien
Lorenz, D.
Austria, Vienna
Universität Wien
Beck, Paul G.
Austria, Vienna
Universität Wien
Nagel, Thorsten
Germany, Tubingen
Eberhard Karls Universität Tübingen
Kowalski, Richard A.
Germany, Tubingen
Eberhard Karls Universität Tübingen
Vauclair, Gérard P.
France, Paris
Cnrs Centre National de la Recherche Scientifique
Charpinet, Stéphane
France, Paris
Cnrs Centre National de la Recherche Scientifique
Chevreton, Michel
France, Meudon
Lesia - Laboratoire D'etudes Spatiales et D'instrumentation en Astrophysique
Solheim, Jan Erik
Norway, Oslo
Universitetet I Oslo
Pakštiene, Erika
Lithuania, Vilnius
Teorinės Fizikos ir Astronomijos Institutas
Fraga, Luciano
Brazil, Florianopolis
Universidade Federal de Santa Catarina
Dalessio, James
United States, Newark
University of Delaware
United States, Greenville
Mt. Cuba Observatory
Statistics
Citations: 36
Authors: 47
Affiliations: 25
Identifiers
Doi:
10.1088/0004-637X/693/1/564
ISSN:
0004637X