Asteroseismology of a star cooled by neutrino emission : the pulsating pre-white dwarf PG 0122+200
Autor(a) principal: | |
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Data de Publicação: | 1998 |
Outros Autores: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/108873 |
Resumo: | Observation of g-mode pulsations in the variable pre-white dwarf (GW Virginis) stars provides a unique means to probe their interiors and to study the late stages of stellar evolution. Multisite campaigns have in several cases proved highly successful in decoding preÈwhite dwarf light curves. Three previous attempts to untangle the pulsation spectrum of the coolest GW Virginis star, PG 0122+200, confirmed the existence of multiple g-modes but left the fundamental period spacing and therefore the star's mass and luminosity in doubt. We present an analysis based on new observations of PG 0122+200 obtained during a Whole Earth Telescope (WET) campaign conducted in the fall of 1996. Although our coverage was, because of bad weather, far poorer than in previous WET campaigns, we confirm the previous result that PG 0122+200 rotates once in 1.6±0.1 days. The most likely period spacing supported by the data implies a mass of 0.69±0.03 Mʘ. Based on the best seismology we can currently do, the cooling of PG 0122+200 is dominated by neutrino losses. This is not true for all pre-white dwarf stars and makes PG 0122+200 the prime candidate for learning useful physics. Constraints placed on the cooling rate of PG 0122+200 by future measurement of dII/dt could provide a unique test of the standard theory of lepton interactions in the (experimentally unexplored) region of phase-space appropriate to pre-white dwarf interiors. |
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O'Brien, M. SeanVauclair, GérardKawaler, Steven D.Watson, Todd K.Winget, Donald EarlNather, R. EdwardMontgomery, Michael HoustonNitta, AtsukoKleinman, Scot JamesSullivan, Denis J.Jiang, XiaojunMarar, T.M. KrishnanSeetha, S.Ashoka, B.N.Bhattacharya, J.Leibowitz, Elia M.Hemar, ShirleyIbbetson, Peter A.Warner, B.Van Zyl, L.Moskalik, PawelZola, StaszekPajdosz, GabrielKrzesinski, JerzyDolez, NoëlChevreton, MichelSolheim, Jan-EricThomassen, T.Kepler, Souza OliveiraGiovannini Junior, OdilonProvencal, Judith L.Wood, Matthew A.Clemens, J. Christopher2015-01-13T02:14:36Z19980004-637Xhttp://hdl.handle.net/10183/108873000277357Observation of g-mode pulsations in the variable pre-white dwarf (GW Virginis) stars provides a unique means to probe their interiors and to study the late stages of stellar evolution. Multisite campaigns have in several cases proved highly successful in decoding preÈwhite dwarf light curves. Three previous attempts to untangle the pulsation spectrum of the coolest GW Virginis star, PG 0122+200, confirmed the existence of multiple g-modes but left the fundamental period spacing and therefore the star's mass and luminosity in doubt. We present an analysis based on new observations of PG 0122+200 obtained during a Whole Earth Telescope (WET) campaign conducted in the fall of 1996. Although our coverage was, because of bad weather, far poorer than in previous WET campaigns, we confirm the previous result that PG 0122+200 rotates once in 1.6±0.1 days. The most likely period spacing supported by the data implies a mass of 0.69±0.03 Mʘ. Based on the best seismology we can currently do, the cooling of PG 0122+200 is dominated by neutrino losses. This is not true for all pre-white dwarf stars and makes PG 0122+200 the prime candidate for learning useful physics. Constraints placed on the cooling rate of PG 0122+200 by future measurement of dII/dt could provide a unique test of the standard theory of lepton interactions in the (experimentally unexplored) region of phase-space appropriate to pre-white dwarf interiors.application/pdfengThe Astrophysical journal. Chicago. Vol. 495, no. 1 pt. 1 (Mar. 1998), p. 458-467Fotometria estelarPulsacoes estelaresRadiação estelarRotacao estelarEstrelas variaveisAnãs brancasMassa atômicaLuminosidadeRotaçãoElementary particlesStars : individual (PG 0122+200)Stars : interiorsStars : pulsars : generalStars : white dwarfsAsteroseismology of a star cooled by neutrino emission : the pulsating pre-white dwarf PG 0122+200Estrangeiroinfo: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:UFRGSORIGINAL000277357.pdf000277357.pdfTexto completo (inglês)application/pdf248089http://www.lume.ufrgs.br/bitstream/10183/108873/1/000277357.pdfd7563a2cfb884327d6b12c811fb5d85aMD51TEXT000277357.pdf.txt000277357.pdf.txtExtracted Texttext/plain46539http://www.lume.ufrgs.br/bitstream/10183/108873/2/000277357.pdf.txt5b875e89f7899012b848b0ab04ce8298MD52THUMBNAIL000277357.pdf.jpg000277357.pdf.jpgGenerated Thumbnailimage/jpeg2105http://www.lume.ufrgs.br/bitstream/10183/108873/3/000277357.pdf.jpg8fd9ad0ead2a6b540863e10b510f507dMD5310183/1088732018-10-23 08:37:43.194oai:www.lume.ufrgs.br:10183/108873Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-23T11:37:43Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Asteroseismology of a star cooled by neutrino emission : the pulsating pre-white dwarf PG 0122+200 |
title |
Asteroseismology of a star cooled by neutrino emission : the pulsating pre-white dwarf PG 0122+200 |
spellingShingle |
Asteroseismology of a star cooled by neutrino emission : the pulsating pre-white dwarf PG 0122+200 O'Brien, M. Sean Fotometria estelar Pulsacoes estelares Radiação estelar Rotacao estelar Estrelas variaveis Anãs brancas Massa atômica Luminosidade Rotação Elementary particles Stars : individual (PG 0122+200) Stars : interiors Stars : pulsars : general Stars : white dwarfs |
title_short |
Asteroseismology of a star cooled by neutrino emission : the pulsating pre-white dwarf PG 0122+200 |
title_full |
Asteroseismology of a star cooled by neutrino emission : the pulsating pre-white dwarf PG 0122+200 |
title_fullStr |
Asteroseismology of a star cooled by neutrino emission : the pulsating pre-white dwarf PG 0122+200 |
title_full_unstemmed |
Asteroseismology of a star cooled by neutrino emission : the pulsating pre-white dwarf PG 0122+200 |
title_sort |
Asteroseismology of a star cooled by neutrino emission : the pulsating pre-white dwarf PG 0122+200 |
author |
O'Brien, M. Sean |
author_facet |
O'Brien, M. Sean Vauclair, Gérard Kawaler, Steven D. Watson, Todd K. Winget, Donald Earl Nather, R. Edward Montgomery, Michael Houston Nitta, Atsuko Kleinman, Scot James Sullivan, Denis J. Jiang, Xiaojun Marar, T.M. Krishnan Seetha, S. Ashoka, B.N. Bhattacharya, J. Leibowitz, Elia M. Hemar, Shirley Ibbetson, Peter A. Warner, B. Van Zyl, L. Moskalik, Pawel Zola, Staszek Pajdosz, Gabriel Krzesinski, Jerzy Dolez, Noël Chevreton, Michel Solheim, Jan-Eric Thomassen, T. Kepler, Souza Oliveira Giovannini Junior, Odilon Provencal, Judith L. Wood, Matthew A. Clemens, J. Christopher |
author_role |
author |
author2 |
Vauclair, Gérard Kawaler, Steven D. Watson, Todd K. Winget, Donald Earl Nather, R. Edward Montgomery, Michael Houston Nitta, Atsuko Kleinman, Scot James Sullivan, Denis J. Jiang, Xiaojun Marar, T.M. Krishnan Seetha, S. Ashoka, B.N. Bhattacharya, J. Leibowitz, Elia M. Hemar, Shirley Ibbetson, Peter A. Warner, B. Van Zyl, L. Moskalik, Pawel Zola, Staszek Pajdosz, Gabriel Krzesinski, Jerzy Dolez, Noël Chevreton, Michel Solheim, Jan-Eric Thomassen, T. Kepler, Souza Oliveira Giovannini Junior, Odilon Provencal, Judith L. Wood, Matthew A. Clemens, J. Christopher |
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 |
dc.contributor.author.fl_str_mv |
O'Brien, M. Sean Vauclair, Gérard Kawaler, Steven D. Watson, Todd K. Winget, Donald Earl Nather, R. Edward Montgomery, Michael Houston Nitta, Atsuko Kleinman, Scot James Sullivan, Denis J. Jiang, Xiaojun Marar, T.M. Krishnan Seetha, S. Ashoka, B.N. Bhattacharya, J. Leibowitz, Elia M. Hemar, Shirley Ibbetson, Peter A. Warner, B. Van Zyl, L. Moskalik, Pawel Zola, Staszek Pajdosz, Gabriel Krzesinski, Jerzy Dolez, Noël Chevreton, Michel Solheim, Jan-Eric Thomassen, T. Kepler, Souza Oliveira Giovannini Junior, Odilon Provencal, Judith L. Wood, Matthew A. Clemens, J. Christopher |
dc.subject.por.fl_str_mv |
Fotometria estelar Pulsacoes estelares Radiação estelar Rotacao estelar Estrelas variaveis Anãs brancas Massa atômica Luminosidade Rotação |
topic |
Fotometria estelar Pulsacoes estelares Radiação estelar Rotacao estelar Estrelas variaveis Anãs brancas Massa atômica Luminosidade Rotação Elementary particles Stars : individual (PG 0122+200) Stars : interiors Stars : pulsars : general Stars : white dwarfs |
dc.subject.eng.fl_str_mv |
Elementary particles Stars : individual (PG 0122+200) Stars : interiors Stars : pulsars : general Stars : white dwarfs |
description |
Observation of g-mode pulsations in the variable pre-white dwarf (GW Virginis) stars provides a unique means to probe their interiors and to study the late stages of stellar evolution. Multisite campaigns have in several cases proved highly successful in decoding preÈwhite dwarf light curves. Three previous attempts to untangle the pulsation spectrum of the coolest GW Virginis star, PG 0122+200, confirmed the existence of multiple g-modes but left the fundamental period spacing and therefore the star's mass and luminosity in doubt. We present an analysis based on new observations of PG 0122+200 obtained during a Whole Earth Telescope (WET) campaign conducted in the fall of 1996. Although our coverage was, because of bad weather, far poorer than in previous WET campaigns, we confirm the previous result that PG 0122+200 rotates once in 1.6±0.1 days. The most likely period spacing supported by the data implies a mass of 0.69±0.03 Mʘ. Based on the best seismology we can currently do, the cooling of PG 0122+200 is dominated by neutrino losses. This is not true for all pre-white dwarf stars and makes PG 0122+200 the prime candidate for learning useful physics. Constraints placed on the cooling rate of PG 0122+200 by future measurement of dII/dt could provide a unique test of the standard theory of lepton interactions in the (experimentally unexplored) region of phase-space appropriate to pre-white dwarf interiors. |
publishDate |
1998 |
dc.date.issued.fl_str_mv |
1998 |
dc.date.accessioned.fl_str_mv |
2015-01-13T02:14:36Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
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/10183/108873 |
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0004-637X |
dc.identifier.nrb.pt_BR.fl_str_mv |
000277357 |
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0004-637X 000277357 |
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http://hdl.handle.net/10183/108873 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
The Astrophysical journal. Chicago. Vol. 495, no. 1 pt. 1 (Mar. 1998), p. 458-467 |
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openAccess |
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application/pdf |
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