A new ZZ Ceti white dwarf pulsator : G30-20

Detalhes bibliográficos
Autor(a) principal: Mukadam, Anjum Shagufta
Data de Publicação: 2002
Outros Autores: Kepler, Souza Oliveira, Winget, Donald Earl, Bergeron, P.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/108908
Resumo: We 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.
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spelling Mukadam, Anjum ShaguftaKepler, Souza OliveiraWinget, Donald EarlBergeron, P.2015-01-14T02:15:54Z20020004-637Xhttp://hdl.handle.net/10183/108908000346479We 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.application/pdfengThe astrophysical journal. Chicago. Vol. 580, no. 1, pt. 1 (Nov. 2002), p. 429-433Atmosferas estelaresFotometria estelarPulsacoes estelaresEstrelas variaveisAnãs brancasTransformada de FourierOscilacoesStars: individual (G30-20,WD2347+128)Stars: oscillationsStars: variables: otherWhite dwarfsA new ZZ Ceti white dwarf pulsator : G30-20Estrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000346479.pdf000346479.pdfTexto completo (inglês)application/pdf267878http://www.lume.ufrgs.br/bitstream/10183/108908/1/000346479.pdf1bd86045632e89d44c0166e583e8b024MD51TEXT000346479.pdf.txt000346479.pdf.txtExtracted Texttext/plain19276http://www.lume.ufrgs.br/bitstream/10183/108908/2/000346479.pdf.txt7b0221e2b883eb4a70207f5ea7234ef1MD52THUMBNAIL000346479.pdf.jpg000346479.pdf.jpgGenerated Thumbnailimage/jpeg1875http://www.lume.ufrgs.br/bitstream/10183/108908/3/000346479.pdf.jpgafa22a4a218d2b999ea535a8e2e3267dMD5310183/1089082018-10-23 08:40:10.324oai:www.lume.ufrgs.br:10183/108908Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-23T11:40:10Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv A new ZZ Ceti white dwarf pulsator : G30-20
title A new ZZ Ceti white dwarf pulsator : G30-20
spellingShingle A new ZZ Ceti white dwarf pulsator : G30-20
Mukadam, Anjum Shagufta
Atmosferas estelares
Fotometria estelar
Pulsacoes estelares
Estrelas variaveis
Anãs brancas
Transformada de Fourier
Oscilacoes
Stars: individual (G30-20,WD2347+128)
Stars: oscillations
Stars: variables: other
White dwarfs
title_short A new ZZ Ceti white dwarf pulsator : G30-20
title_full A new ZZ Ceti white dwarf pulsator : G30-20
title_fullStr A new ZZ Ceti white dwarf pulsator : G30-20
title_full_unstemmed A new ZZ Ceti white dwarf pulsator : G30-20
title_sort A new ZZ Ceti white dwarf pulsator : G30-20
author Mukadam, Anjum Shagufta
author_facet Mukadam, Anjum Shagufta
Kepler, Souza Oliveira
Winget, Donald Earl
Bergeron, P.
author_role author
author2 Kepler, Souza Oliveira
Winget, Donald Earl
Bergeron, P.
author2_role author
author
author
dc.contributor.author.fl_str_mv Mukadam, Anjum Shagufta
Kepler, Souza Oliveira
Winget, Donald Earl
Bergeron, P.
dc.subject.por.fl_str_mv Atmosferas estelares
Fotometria estelar
Pulsacoes estelares
Estrelas variaveis
Anãs brancas
Transformada de Fourier
Oscilacoes
topic Atmosferas estelares
Fotometria estelar
Pulsacoes estelares
Estrelas variaveis
Anãs brancas
Transformada de Fourier
Oscilacoes
Stars: individual (G30-20,WD2347+128)
Stars: oscillations
Stars: variables: other
White dwarfs
dc.subject.eng.fl_str_mv Stars: individual (G30-20,WD2347+128)
Stars: oscillations
Stars: variables: other
White dwarfs
description We 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.
publishDate 2002
dc.date.issued.fl_str_mv 2002
dc.date.accessioned.fl_str_mv 2015-01-14T02:15:54Z
dc.type.driver.fl_str_mv Estrangeiro
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dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10183/108908
dc.identifier.issn.pt_BR.fl_str_mv 0004-637X
dc.identifier.nrb.pt_BR.fl_str_mv 000346479
identifier_str_mv 0004-637X
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url http://hdl.handle.net/10183/108908
dc.language.iso.fl_str_mv eng
language eng
dc.relation.ispartof.pt_BR.fl_str_mv The astrophysical journal. Chicago. Vol. 580, no. 1, pt. 1 (Nov. 2002), p. 429-433
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFRGS
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reponame_str Repositório Institucional da UFRGS
collection Repositório Institucional da UFRGS
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