The pulsation modes of the pre-white dwarf PG 1159-035
Autor(a) principal: | |
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Data de Publicação: | 2008 |
Outros Autores: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/98988 |
Resumo: | Context. PG 1159-035, a pre-white dwarf with Teff ~_140 000 K, is the prototype of both two classes: the PG 1159 spectroscopic class and the DOV pulsating class. Previous studies of PG 1159-035 photometric data obtained with the Whole Earth Telescope (WET) showed a rich frequency spectrum allowing the identification of 122 pulsation modes. Analyzing the periods of pulsation, it is possible to measure the stellar mass, the rotational period and the inclination of the rotation axis, to estimate an upper limit for the magnetic field, and even to obtain information about the inner stratification of the star. Aims. We have three principal aims: to increase the number of detected and identified pulsation modes in PG 1159-035, study trapping of the star’s pulsation modes, and to improve or constrain the determination of stellar parameters. Methods. We used all available WET photometric data from 1983, 1985, 1989, 1993 and 2002 to identify the pulsation periods. Results. We identified 76 additional pulsation modes, increasing to 198 the number of known pulsation modes in PG 1159-035, the largest number of modes detected in any star besides the Sun. From the period spacing we estimated a mass M/Mʘ = 0.59 ± 0.02 for PG 1159-035, with the uncertainty dominated by the models, not the observation. Deviations in the regular period spacing suggest that some of the pulsation modes are trapped, even though the star is a pre-white dwarf and the gravitational settling is ongoing. The position of the transition zone that causes the mode trapping was calculated at rc/R. = 0.83 ± 0.05. From the multiplet splitting, we calculated the rotational period Prot = 1.3920 ± 0.0008 days and an upper limit for the magnetic field, B < 2000 G. The total power of the pulsation modes at the stellar surface changed less than 30% for l = 1 modes and less than 50% for l = 2 modes. We find no evidence of linear combinations between the 198 pulsation mode frequencies. PG 1159-035 models have not significative convection zones, supporting the hypothesis that nonlinearity arises in the convection zones in cooler pulsating white dwarf stars. |
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Costa, Jose Eduardo da SilveiraKepler, Souza OliveiraWinget, Donald EarlO'Brien, M. SeanKawaler, Steven D.Costa, Alex Fabiano Murillo daGiovannini Junior, OdilonKanaan Neto, Antonio NemerMukadam, Anjum ShaguftaMullally, FergalNitta, AtsukoProvencal, Judith L.Shipman, Harry L.Wood, Matthew A.Ahrens, T.J.Grauer, Albert D.Kilic, MukreminBradley, Paul A.Sekiguchi, KazuhiroCrowe, Richard A.Jiang, XiaojunSullivan, Denis J.Sullivan, TerryRosen, RachelClemens, J. ChristopherJanulis, RimvydasO'Donoghue, DarraghOgloza, WaldemarBaran, AndrzejSilvotti, RobertoMarinoni, S.Vauclair, GérardDolez, NoëlChevreton, MichelDreizler, StefanSchuh, Sonja L.Deetjen, Jochen L.Nagel, ThorstenSolheim, Jan-EricGonzalez Perez, Jose MiguelUlla, AnaBarstow, Martin A.Burleigh, MattGood, Simon A.Metcalfe, Travis S.Kim, Seung-LeeLee, H.Sergeev, A.Akan, Mustafa CanCakirli, ÖPaparo, MargitVirághalmy, GézaAshoka, B.N.Handler, GeraldHürkal, ÖzlemJohannessen, F.Kleinman, Scot JamesKalytis, RomualdasKrzesinski, JerzyKlumpe, Eric W.Larrison, JesseLawrence, T.Meistas, Edmundas G.Martinez, PeterNather, R. EdwardFu, Jianning NingPakstiene, ErikaRosen, R.Romero-Colmenero, EncarniRiddle, Reed L.Seetha, S.Silvestri, Nicole M.Vuckovic, MajaWarner, B.Zola, StaszekAlthaus, Leandro GabrielCórsico, Alejandro HugoMontgomery, Michael Houston2014-07-31T02:05:13Z20080004-6361http://hdl.handle.net/10183/98988000625057Context. PG 1159-035, a pre-white dwarf with Teff ~_140 000 K, is the prototype of both two classes: the PG 1159 spectroscopic class and the DOV pulsating class. Previous studies of PG 1159-035 photometric data obtained with the Whole Earth Telescope (WET) showed a rich frequency spectrum allowing the identification of 122 pulsation modes. Analyzing the periods of pulsation, it is possible to measure the stellar mass, the rotational period and the inclination of the rotation axis, to estimate an upper limit for the magnetic field, and even to obtain information about the inner stratification of the star. Aims. We have three principal aims: to increase the number of detected and identified pulsation modes in PG 1159-035, study trapping of the star’s pulsation modes, and to improve or constrain the determination of stellar parameters. Methods. We used all available WET photometric data from 1983, 1985, 1989, 1993 and 2002 to identify the pulsation periods. Results. We identified 76 additional pulsation modes, increasing to 198 the number of known pulsation modes in PG 1159-035, the largest number of modes detected in any star besides the Sun. From the period spacing we estimated a mass M/Mʘ = 0.59 ± 0.02 for PG 1159-035, with the uncertainty dominated by the models, not the observation. Deviations in the regular period spacing suggest that some of the pulsation modes are trapped, even though the star is a pre-white dwarf and the gravitational settling is ongoing. The position of the transition zone that causes the mode trapping was calculated at rc/R. = 0.83 ± 0.05. From the multiplet splitting, we calculated the rotational period Prot = 1.3920 ± 0.0008 days and an upper limit for the magnetic field, B < 2000 G. The total power of the pulsation modes at the stellar surface changed less than 30% for l = 1 modes and less than 50% for l = 2 modes. We find no evidence of linear combinations between the 198 pulsation mode frequencies. PG 1159-035 models have not significative convection zones, supporting the hypothesis that nonlinearity arises in the convection zones in cooler pulsating white dwarf stars.application/pdfengAstronomy and Astrophysics. Berlin. Vol. 477, no. 2 (Jan. 2008), p. 627-640AstrofísicaOscilacoesInterior estelarAnãs brancasPulsacoes estelaresStars: oscillationsStars: individual: PG 1159-035Stars: interiorsStars: white dwarfsThe pulsation modes of the pre-white dwarf PG 1159-035Estrangeiroinfo: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:UFRGSORIGINAL000625057.pdf000625057.pdfTexto completo (inglês)application/pdf900299http://www.lume.ufrgs.br/bitstream/10183/98988/1/000625057.pdf4f909a45cb417bf1be318fa8a90cedd6MD51TEXT000625057.pdf.txt000625057.pdf.txtExtracted Texttext/plain114503http://www.lume.ufrgs.br/bitstream/10183/98988/2/000625057.pdf.txt87675e281062502eb46de41a99e8f619MD52THUMBNAIL000625057.pdf.jpg000625057.pdf.jpgGenerated Thumbnailimage/jpeg2163http://www.lume.ufrgs.br/bitstream/10183/98988/3/000625057.pdf.jpgaa89bca93e284b8965a9a8ba2cca8b1cMD5310183/989882023-08-16 03:33:08.127437oai:www.lume.ufrgs.br:10183/98988Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-08-16T06:33:08Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
The pulsation modes of the pre-white dwarf PG 1159-035 |
title |
The pulsation modes of the pre-white dwarf PG 1159-035 |
spellingShingle |
The pulsation modes of the pre-white dwarf PG 1159-035 Costa, Jose Eduardo da Silveira Astrofísica Oscilacoes Interior estelar Anãs brancas Pulsacoes estelares Stars: oscillations Stars: individual: PG 1159-035 Stars: interiors Stars: white dwarfs |
title_short |
The pulsation modes of the pre-white dwarf PG 1159-035 |
title_full |
The pulsation modes of the pre-white dwarf PG 1159-035 |
title_fullStr |
The pulsation modes of the pre-white dwarf PG 1159-035 |
title_full_unstemmed |
The pulsation modes of the pre-white dwarf PG 1159-035 |
title_sort |
The pulsation modes of the pre-white dwarf PG 1159-035 |
author |
Costa, Jose Eduardo da Silveira |
author_facet |
Costa, Jose Eduardo da Silveira Kepler, Souza Oliveira Winget, Donald Earl O'Brien, M. Sean Kawaler, Steven D. Costa, Alex Fabiano Murillo da Giovannini Junior, Odilon Kanaan Neto, Antonio Nemer Mukadam, Anjum Shagufta Mullally, Fergal Nitta, Atsuko Provencal, Judith L. Shipman, Harry L. Wood, Matthew A. Ahrens, T.J. Grauer, Albert D. Kilic, Mukremin Bradley, Paul A. Sekiguchi, Kazuhiro Crowe, Richard A. Jiang, Xiaojun Sullivan, Denis J. Sullivan, Terry Rosen, Rachel Clemens, J. Christopher Janulis, Rimvydas O'Donoghue, Darragh Ogloza, Waldemar Baran, Andrzej Silvotti, Roberto Marinoni, S. Vauclair, Gérard Dolez, Noël Chevreton, Michel Dreizler, Stefan Schuh, Sonja L. Deetjen, Jochen L. Nagel, Thorsten Solheim, Jan-Eric Gonzalez Perez, Jose Miguel Ulla, Ana Barstow, Martin A. Burleigh, Matt Good, Simon A. Metcalfe, Travis S. Kim, Seung-Lee Lee, H. Sergeev, A. Akan, Mustafa Can Cakirli, Ö Paparo, Margit Virághalmy, Géza Ashoka, B.N. Handler, Gerald Hürkal, Özlem Johannessen, F. Kleinman, Scot James Kalytis, Romualdas Krzesinski, Jerzy Klumpe, Eric W. Larrison, Jesse Lawrence, T. Meistas, Edmundas G. Martinez, Peter Nather, R. Edward Fu, Jianning Ning Pakstiene, Erika Rosen, R. Romero-Colmenero, Encarni Riddle, Reed L. Seetha, S. Silvestri, Nicole M. Vuckovic, Maja Warner, B. Zola, Staszek Althaus, Leandro Gabriel Córsico, Alejandro Hugo Montgomery, Michael Houston |
author_role |
author |
author2 |
Kepler, Souza Oliveira Winget, Donald Earl O'Brien, M. Sean Kawaler, Steven D. Costa, Alex Fabiano Murillo da Giovannini Junior, Odilon Kanaan Neto, Antonio Nemer Mukadam, Anjum Shagufta Mullally, Fergal Nitta, Atsuko Provencal, Judith L. Shipman, Harry L. Wood, Matthew A. Ahrens, T.J. Grauer, Albert D. Kilic, Mukremin Bradley, Paul A. Sekiguchi, Kazuhiro Crowe, Richard A. Jiang, Xiaojun Sullivan, Denis J. Sullivan, Terry Rosen, Rachel Clemens, J. Christopher Janulis, Rimvydas O'Donoghue, Darragh Ogloza, Waldemar Baran, Andrzej Silvotti, Roberto Marinoni, S. Vauclair, Gérard Dolez, Noël Chevreton, Michel Dreizler, Stefan Schuh, Sonja L. Deetjen, Jochen L. Nagel, Thorsten Solheim, Jan-Eric Gonzalez Perez, Jose Miguel Ulla, Ana Barstow, Martin A. Burleigh, Matt Good, Simon A. Metcalfe, Travis S. Kim, Seung-Lee Lee, H. Sergeev, A. Akan, Mustafa Can Cakirli, Ö Paparo, Margit Virághalmy, Géza Ashoka, B.N. Handler, Gerald Hürkal, Özlem Johannessen, F. Kleinman, Scot James Kalytis, Romualdas Krzesinski, Jerzy Klumpe, Eric W. Larrison, Jesse Lawrence, T. Meistas, Edmundas G. Martinez, Peter Nather, R. Edward Fu, Jianning Ning Pakstiene, Erika Rosen, R. Romero-Colmenero, Encarni Riddle, Reed L. Seetha, S. Silvestri, Nicole M. Vuckovic, Maja Warner, B. Zola, Staszek Althaus, Leandro Gabriel Córsico, Alejandro Hugo Montgomery, Michael Houston |
author2_role |
author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Costa, Jose Eduardo da Silveira Kepler, Souza Oliveira Winget, Donald Earl O'Brien, M. Sean Kawaler, Steven D. Costa, Alex Fabiano Murillo da Giovannini Junior, Odilon Kanaan Neto, Antonio Nemer Mukadam, Anjum Shagufta Mullally, Fergal Nitta, Atsuko Provencal, Judith L. Shipman, Harry L. Wood, Matthew A. Ahrens, T.J. Grauer, Albert D. Kilic, Mukremin Bradley, Paul A. Sekiguchi, Kazuhiro Crowe, Richard A. Jiang, Xiaojun Sullivan, Denis J. Sullivan, Terry Rosen, Rachel Clemens, J. Christopher Janulis, Rimvydas O'Donoghue, Darragh Ogloza, Waldemar Baran, Andrzej Silvotti, Roberto Marinoni, S. Vauclair, Gérard Dolez, Noël Chevreton, Michel Dreizler, Stefan Schuh, Sonja L. Deetjen, Jochen L. Nagel, Thorsten Solheim, Jan-Eric Gonzalez Perez, Jose Miguel Ulla, Ana Barstow, Martin A. Burleigh, Matt Good, Simon A. Metcalfe, Travis S. Kim, Seung-Lee Lee, H. Sergeev, A. Akan, Mustafa Can Cakirli, Ö Paparo, Margit Virághalmy, Géza Ashoka, B.N. Handler, Gerald Hürkal, Özlem Johannessen, F. Kleinman, Scot James Kalytis, Romualdas Krzesinski, Jerzy Klumpe, Eric W. Larrison, Jesse Lawrence, T. Meistas, Edmundas G. Martinez, Peter Nather, R. Edward Fu, Jianning Ning Pakstiene, Erika Rosen, R. Romero-Colmenero, Encarni Riddle, Reed L. Seetha, S. Silvestri, Nicole M. Vuckovic, Maja Warner, B. Zola, Staszek Althaus, Leandro Gabriel Córsico, Alejandro Hugo Montgomery, Michael Houston |
dc.subject.por.fl_str_mv |
Astrofísica Oscilacoes Interior estelar Anãs brancas Pulsacoes estelares |
topic |
Astrofísica Oscilacoes Interior estelar Anãs brancas Pulsacoes estelares Stars: oscillations Stars: individual: PG 1159-035 Stars: interiors Stars: white dwarfs |
dc.subject.eng.fl_str_mv |
Stars: oscillations Stars: individual: PG 1159-035 Stars: interiors Stars: white dwarfs |
description |
Context. PG 1159-035, a pre-white dwarf with Teff ~_140 000 K, is the prototype of both two classes: the PG 1159 spectroscopic class and the DOV pulsating class. Previous studies of PG 1159-035 photometric data obtained with the Whole Earth Telescope (WET) showed a rich frequency spectrum allowing the identification of 122 pulsation modes. Analyzing the periods of pulsation, it is possible to measure the stellar mass, the rotational period and the inclination of the rotation axis, to estimate an upper limit for the magnetic field, and even to obtain information about the inner stratification of the star. Aims. We have three principal aims: to increase the number of detected and identified pulsation modes in PG 1159-035, study trapping of the star’s pulsation modes, and to improve or constrain the determination of stellar parameters. Methods. We used all available WET photometric data from 1983, 1985, 1989, 1993 and 2002 to identify the pulsation periods. Results. We identified 76 additional pulsation modes, increasing to 198 the number of known pulsation modes in PG 1159-035, the largest number of modes detected in any star besides the Sun. From the period spacing we estimated a mass M/Mʘ = 0.59 ± 0.02 for PG 1159-035, with the uncertainty dominated by the models, not the observation. Deviations in the regular period spacing suggest that some of the pulsation modes are trapped, even though the star is a pre-white dwarf and the gravitational settling is ongoing. The position of the transition zone that causes the mode trapping was calculated at rc/R. = 0.83 ± 0.05. From the multiplet splitting, we calculated the rotational period Prot = 1.3920 ± 0.0008 days and an upper limit for the magnetic field, B < 2000 G. The total power of the pulsation modes at the stellar surface changed less than 30% for l = 1 modes and less than 50% for l = 2 modes. We find no evidence of linear combinations between the 198 pulsation mode frequencies. PG 1159-035 models have not significative convection zones, supporting the hypothesis that nonlinearity arises in the convection zones in cooler pulsating white dwarf stars. |
publishDate |
2008 |
dc.date.issued.fl_str_mv |
2008 |
dc.date.accessioned.fl_str_mv |
2014-07-31T02:05:13Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
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info:eu-repo/semantics/publishedVersion |
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article |
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publishedVersion |
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http://hdl.handle.net/10183/98988 |
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0004-6361 |
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000625057 |
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0004-6361 000625057 |
url |
http://hdl.handle.net/10183/98988 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Astronomy and Astrophysics. Berlin. Vol. 477, no. 2 (Jan. 2008), p. 627-640 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
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