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dc.contributor.authorMukadam, Anjum Shaguftapt_BR
dc.contributor.authorKepler, Souza Oliveirapt_BR
dc.contributor.authorWinget, Donald Earlpt_BR
dc.contributor.authorBergeron, P.pt_BR
dc.date.accessioned2015-01-14T02:15:54Zpt_BR
dc.date.issued2002pt_BR
dc.identifier.issn0004-637Xpt_BR
dc.identifier.urihttp://hdl.handle.net/10183/108908pt_BR
dc.description.abstractWe report the discovery of a new hydrogen atmosphere variable white dwarf (DAV; ZZ Ceti), G30-20, a high-amplitude, long-period pulsator. The Fourier transform of its light curve shows power around 1050–1125 s. We suspect the existence of multiple periodicities in this region, probably corresponding to different radial order (k) modes, but our observations are not long enough to resolve them. This discovery increases the number of known DAVs to 32. Our best fit to its optical spectrum gives Teff=11, 070 ± 180 K and log g = 7:95 ± 0:06. This implies that G30-20 is the coolest known DAV.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofThe astrophysical journal. Chicago. Vol. 580, no. 1, pt. 1 (Nov. 2002), p. 429-433pt_BR
dc.rightsOpen Accessen
dc.subjectAtmosferas estelarespt_BR
dc.subjectStars: individual (G30-20,WD2347+128)en
dc.subjectFotometria estelarpt_BR
dc.subjectStars: oscillationsen
dc.subjectStars: variables: otheren
dc.subjectPulsacoes estelarespt_BR
dc.subjectEstrelas variaveispt_BR
dc.subjectWhite dwarfsen
dc.subjectAnãs brancaspt_BR
dc.subjectTransformada de Fourierpt_BR
dc.subjectOscilacoespt_BR
dc.titleA new ZZ Ceti white dwarf pulsator : G30-20pt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000346479pt_BR
dc.type.originEstrangeiropt_BR


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