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dc.contributor.authorProvencal, Judith L.pt_BR
dc.contributor.authorMontgomery, Michael Houstonpt_BR
dc.contributor.authorKanaan Neto, Antonio Nemerpt_BR
dc.contributor.authorShipman, Harry L.pt_BR
dc.contributor.authorChilders, D.pt_BR
dc.contributor.authorBaran, Andrzejpt_BR
dc.contributor.authorKepler, Souza Oliveirapt_BR
dc.contributor.authorReed, M. D.pt_BR
dc.contributor.authorZhou, Ai-Yingpt_BR
dc.contributor.authorEggen, J.pt_BR
dc.contributor.authorWatson, Todd K.pt_BR
dc.contributor.authorWinget, Donald Earlpt_BR
dc.contributor.authorThompson, S. E.pt_BR
dc.contributor.authorRiaz, B.pt_BR
dc.contributor.authorNitta, Atsukopt_BR
dc.contributor.authorKleinman, Scot Jamespt_BR
dc.contributor.authorCrowe, Richard A.pt_BR
dc.contributor.authorSlivkoff, Jaypt_BR
dc.contributor.authorSherard, P.pt_BR
dc.contributor.authorPurves, Norman G.pt_BR
dc.contributor.authorBinder, Philippe M.pt_BR
dc.contributor.authorKnight, R.pt_BR
dc.contributor.authorKim, Seung-Leept_BR
dc.contributor.authorChen, Wen-Pingpt_BR
dc.contributor.authorYang, M.pt_BR
dc.contributor.authorLin, Hung-Chinpt_BR
dc.contributor.authorLin, Chien-Chengpt_BR
dc.contributor.authorChen, C.-W.pt_BR
dc.contributor.authorJiang, Xiaojunpt_BR
dc.contributor.authorSergeev, A.pt_BR
dc.contributor.authorMkrtichian, Davidpt_BR
dc.contributor.authorAndreev, M.pt_BR
dc.contributor.authorJanulis, Rimvydaspt_BR
dc.contributor.authorSiwak, Michalpt_BR
dc.contributor.authorZola, Staszekpt_BR
dc.contributor.authorKoziel-Wierzbowska, Dorotapt_BR
dc.contributor.authorStachowski, G.pt_BR
dc.contributor.authorPaparo, Margitpt_BR
dc.contributor.authorBognár, Zsófiapt_BR
dc.contributor.authorHandler, Geraldpt_BR
dc.contributor.authorLorenz, Denisept_BR
dc.contributor.authorSteininger, Brunopt_BR
dc.contributor.authorBeck, Paulpt_BR
dc.contributor.authorNagel, Thorstenpt_BR
dc.contributor.authorKusterer, D.pt_BR
dc.contributor.authorHoffman, A.pt_BR
dc.contributor.authorReiff, E.pt_BR
dc.contributor.authorKowalski, R.pt_BR
dc.contributor.authorVauclair, Gérardpt_BR
dc.contributor.authorCharpinet, Stéphanept_BR
dc.contributor.authorChevreton, Michelpt_BR
dc.contributor.authorSolheim, Jan-Ericpt_BR
dc.contributor.authorPakstiene, Erikapt_BR
dc.contributor.authorFraga, Lucianopt_BR
dc.contributor.authorDalessio, J.pt_BR
dc.date.accessioned2015-01-15T02:15:09Zpt_BR
dc.date.issued2009pt_BR
dc.identifier.issn0004-637Xpt_BR
dc.identifier.urihttp://hdl.handle.net/10183/108971pt_BR
dc.description.abstractWe 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 =l 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.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofThe astrophysical journal. Bristol. Vol. 693, no. 1 (Mar. 2009), p. 564-585pt_BR
dc.rightsOpen Accessen
dc.subjectEvolucao estelarpt_BR
dc.subjectStars: evolutionen
dc.subjectDinâmica de fluidos astrofísicospt_BR
dc.subjectStars: individual (GD358)en
dc.subjectPulsacoes estelarespt_BR
dc.subjectStars: oscillationsen
dc.subjectWhite dwarfsen
dc.subjectMagnetismo estelarpt_BR
dc.subjectRadiação estelarpt_BR
dc.subjectEspectros estelarespt_BR
dc.subjectEstrutura estelarpt_BR
dc.subjectEstrelas variaveispt_BR
dc.subjectAnãs brancaspt_BR
dc.title2006 Whole Earth Telescope observations of GD358 : a new look at the prototype DBVpt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000766225pt_BR
dc.type.originEstrangeiropt_BR


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