The everchanging pulsating white dwarf GD358
Autor(a) principal: | |
---|---|
Data de Publicação: | 2003 |
Outros Autores: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/109133 |
Resumo: | We report 323 hours of nearly uninterrupted time series photometric observations of the DBV star GD 358 acquired with the Whole Earth Telescope (WET) during May 23rd to June 8th, 2000. We acquired more than 232 000 independent measurements. We also report on 48 hours of time-series photometric observations in Aug 1996. We detected the non-radial g-modes consistent with degree l = 1 and radial order 8 to 20 and their linear combinations up to 6th order. We also detect, for the first time, a high amplitude l = 2 mode, with a period of 796 s. In the 2000 WET data, the largest amplitude modes are similar to those detected with the WET observations of 1990 and 1994, but the highest combination order previously detected was 4th order. At one point during the 1996 observations, most of the pulsation energy was transferred into the radial order k = 8 mode, which displayed a sinusoidal pulse shape in spite of the large amplitude. The multiplet structure of the individual modes changes from year to year, and during the 2000 observations only the k = 9 mode displays clear normal triplet structure. Even though the pulsation amplitudes change on timescales of days and years, the eigenfrequencies remain essentially the same, showing the stellar structure is not changing on any dynamical timescale. |
id |
UFRGS-2_00b60762be00e57c1d3e5c4ec625028e |
---|---|
oai_identifier_str |
oai:www.lume.ufrgs.br:10183/109133 |
network_acronym_str |
UFRGS-2 |
network_name_str |
Repositório Institucional da UFRGS |
repository_id_str |
|
spelling |
Kepler, Souza OliveiraNather, R. EdwardWinget, Donald EarlNitta, AtsukoKleinman, Scot JamesMetcalfe, Travis S.Sekiguchi, KazuhiroJiang, XiaojunSullivan, Denis J.Sullivan, TerryJanulis, RimvydasMeistas, Edmundas G.Kalytis, RomualdasKrzesinski, JerzyOgloza, WaldemarZola, StaszekO'Donoghue, DarraghRomero-Colmenero, EncarniMartinez, PeterDreizler, StefanDeetjen, Jochen L.Nagel, ThorstenSchuh, Sonja L.Vauclair, GérardFu, Jianning NingChevreton, MichelSolheim, Jan-EricGonzalez Perez, Jose MiguelJohannessen, F.Kanaan Neto, Antonio NemerCosta, Jose Eduardo da SilveiraCosta, Alex Fabiano Murillo daWood, Matthew A.Silvestri, Nicole M.Ahrens, T.J.Jones, Aaron KyleCollins, A.E.Boyer, M.Shaw, James ScottMukadam, Anjum ShaguftaKlumpe, Eric W.Larrison, JesseKawaler, Steven D.Riddle, Reed L.Ulla, AnaBradley, Paul A.2015-01-22T02:13:49Z20030004-6361http://hdl.handle.net/10183/109133000381415We report 323 hours of nearly uninterrupted time series photometric observations of the DBV star GD 358 acquired with the Whole Earth Telescope (WET) during May 23rd to June 8th, 2000. We acquired more than 232 000 independent measurements. We also report on 48 hours of time-series photometric observations in Aug 1996. We detected the non-radial g-modes consistent with degree l = 1 and radial order 8 to 20 and their linear combinations up to 6th order. We also detect, for the first time, a high amplitude l = 2 mode, with a period of 796 s. In the 2000 WET data, the largest amplitude modes are similar to those detected with the WET observations of 1990 and 1994, but the highest combination order previously detected was 4th order. At one point during the 1996 observations, most of the pulsation energy was transferred into the radial order k = 8 mode, which displayed a sinusoidal pulse shape in spite of the large amplitude. The multiplet structure of the individual modes changes from year to year, and during the 2000 observations only the k = 9 mode displays clear normal triplet structure. Even though the pulsation amplitudes change on timescales of days and years, the eigenfrequencies remain essentially the same, showing the stellar structure is not changing on any dynamical timescale.application/pdfengAstronomy and astrophysics. Berlin. Vol. 401, no. 2 (Apr. 2003), p. 639-654Fotometria estelarPulsacoes estelaresEstrelas variaveisStars: white dwarfsStars: variables: generalStars: oscillationsStars: individual: GD 358Stars: evolutionThe everchanging pulsating white dwarf GD358Estrangeiroinfo: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:UFRGSORIGINAL000381415.pdf000381415.pdfTexto completo (inglês)application/pdf712381http://www.lume.ufrgs.br/bitstream/10183/109133/1/000381415.pdf38d8de3324f74c23a953ead2b5da7586MD51TEXT000381415.pdf.txt000381415.pdf.txtExtracted Texttext/plain69793http://www.lume.ufrgs.br/bitstream/10183/109133/2/000381415.pdf.txtb84aaf7eaa3b2a471629cad524530d02MD52THUMBNAIL000381415.pdf.jpg000381415.pdf.jpgGenerated Thumbnailimage/jpeg1784http://www.lume.ufrgs.br/bitstream/10183/109133/3/000381415.pdf.jpg30b05dd599e5a99638fa8f986b3cdbe4MD5310183/1091332023-08-16 03:31:59.793812oai:www.lume.ufrgs.br:10183/109133Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-08-16T06:31:59Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
The everchanging pulsating white dwarf GD358 |
title |
The everchanging pulsating white dwarf GD358 |
spellingShingle |
The everchanging pulsating white dwarf GD358 Kepler, Souza Oliveira Fotometria estelar Pulsacoes estelares Estrelas variaveis Stars: white dwarfs Stars: variables: general Stars: oscillations Stars: individual: GD 358 Stars: evolution |
title_short |
The everchanging pulsating white dwarf GD358 |
title_full |
The everchanging pulsating white dwarf GD358 |
title_fullStr |
The everchanging pulsating white dwarf GD358 |
title_full_unstemmed |
The everchanging pulsating white dwarf GD358 |
title_sort |
The everchanging pulsating white dwarf GD358 |
author |
Kepler, Souza Oliveira |
author_facet |
Kepler, Souza Oliveira Nather, R. Edward Winget, Donald Earl Nitta, Atsuko Kleinman, Scot James Metcalfe, Travis S. Sekiguchi, Kazuhiro Jiang, Xiaojun Sullivan, Denis J. Sullivan, Terry Janulis, Rimvydas Meistas, Edmundas G. Kalytis, Romualdas Krzesinski, Jerzy Ogloza, Waldemar Zola, Staszek O'Donoghue, Darragh Romero-Colmenero, Encarni Martinez, Peter Dreizler, Stefan Deetjen, Jochen L. Nagel, Thorsten Schuh, Sonja L. Vauclair, Gérard Fu, Jianning Ning Chevreton, Michel Solheim, Jan-Eric Gonzalez Perez, Jose Miguel Johannessen, F. Kanaan Neto, Antonio Nemer Costa, Jose Eduardo da Silveira Costa, Alex Fabiano Murillo da Wood, Matthew A. Silvestri, Nicole M. Ahrens, T.J. Jones, Aaron Kyle Collins, A.E. Boyer, M. Shaw, James Scott Mukadam, Anjum Shagufta Klumpe, Eric W. Larrison, Jesse Kawaler, Steven D. Riddle, Reed L. Ulla, Ana Bradley, Paul A. |
author_role |
author |
author2 |
Nather, R. Edward Winget, Donald Earl Nitta, Atsuko Kleinman, Scot James Metcalfe, Travis S. Sekiguchi, Kazuhiro Jiang, Xiaojun Sullivan, Denis J. Sullivan, Terry Janulis, Rimvydas Meistas, Edmundas G. Kalytis, Romualdas Krzesinski, Jerzy Ogloza, Waldemar Zola, Staszek O'Donoghue, Darragh Romero-Colmenero, Encarni Martinez, Peter Dreizler, Stefan Deetjen, Jochen L. Nagel, Thorsten Schuh, Sonja L. Vauclair, Gérard Fu, Jianning Ning Chevreton, Michel Solheim, Jan-Eric Gonzalez Perez, Jose Miguel Johannessen, F. Kanaan Neto, Antonio Nemer Costa, Jose Eduardo da Silveira Costa, Alex Fabiano Murillo da Wood, Matthew A. Silvestri, Nicole M. Ahrens, T.J. Jones, Aaron Kyle Collins, A.E. Boyer, M. Shaw, James Scott Mukadam, Anjum Shagufta Klumpe, Eric W. Larrison, Jesse Kawaler, Steven D. Riddle, Reed L. Ulla, Ana Bradley, Paul A. |
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 |
dc.contributor.author.fl_str_mv |
Kepler, Souza Oliveira Nather, R. Edward Winget, Donald Earl Nitta, Atsuko Kleinman, Scot James Metcalfe, Travis S. Sekiguchi, Kazuhiro Jiang, Xiaojun Sullivan, Denis J. Sullivan, Terry Janulis, Rimvydas Meistas, Edmundas G. Kalytis, Romualdas Krzesinski, Jerzy Ogloza, Waldemar Zola, Staszek O'Donoghue, Darragh Romero-Colmenero, Encarni Martinez, Peter Dreizler, Stefan Deetjen, Jochen L. Nagel, Thorsten Schuh, Sonja L. Vauclair, Gérard Fu, Jianning Ning Chevreton, Michel Solheim, Jan-Eric Gonzalez Perez, Jose Miguel Johannessen, F. Kanaan Neto, Antonio Nemer Costa, Jose Eduardo da Silveira Costa, Alex Fabiano Murillo da Wood, Matthew A. Silvestri, Nicole M. Ahrens, T.J. Jones, Aaron Kyle Collins, A.E. Boyer, M. Shaw, James Scott Mukadam, Anjum Shagufta Klumpe, Eric W. Larrison, Jesse Kawaler, Steven D. Riddle, Reed L. Ulla, Ana Bradley, Paul A. |
dc.subject.por.fl_str_mv |
Fotometria estelar Pulsacoes estelares Estrelas variaveis |
topic |
Fotometria estelar Pulsacoes estelares Estrelas variaveis Stars: white dwarfs Stars: variables: general Stars: oscillations Stars: individual: GD 358 Stars: evolution |
dc.subject.eng.fl_str_mv |
Stars: white dwarfs Stars: variables: general Stars: oscillations Stars: individual: GD 358 Stars: evolution |
description |
We report 323 hours of nearly uninterrupted time series photometric observations of the DBV star GD 358 acquired with the Whole Earth Telescope (WET) during May 23rd to June 8th, 2000. We acquired more than 232 000 independent measurements. We also report on 48 hours of time-series photometric observations in Aug 1996. We detected the non-radial g-modes consistent with degree l = 1 and radial order 8 to 20 and their linear combinations up to 6th order. We also detect, for the first time, a high amplitude l = 2 mode, with a period of 796 s. In the 2000 WET data, the largest amplitude modes are similar to those detected with the WET observations of 1990 and 1994, but the highest combination order previously detected was 4th order. At one point during the 1996 observations, most of the pulsation energy was transferred into the radial order k = 8 mode, which displayed a sinusoidal pulse shape in spite of the large amplitude. The multiplet structure of the individual modes changes from year to year, and during the 2000 observations only the k = 9 mode displays clear normal triplet structure. Even though the pulsation amplitudes change on timescales of days and years, the eigenfrequencies remain essentially the same, showing the stellar structure is not changing on any dynamical timescale. |
publishDate |
2003 |
dc.date.issued.fl_str_mv |
2003 |
dc.date.accessioned.fl_str_mv |
2015-01-22T02:13:49Z |
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/10183/109133 |
dc.identifier.issn.pt_BR.fl_str_mv |
0004-6361 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000381415 |
identifier_str_mv |
0004-6361 000381415 |
url |
http://hdl.handle.net/10183/109133 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Astronomy and astrophysics. Berlin. Vol. 401, no. 2 (Apr. 2003), p. 639-654 |
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 instname:Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS |
instname_str |
Universidade Federal do Rio Grande do Sul (UFRGS) |
instacron_str |
UFRGS |
institution |
UFRGS |
reponame_str |
Repositório Institucional da UFRGS |
collection |
Repositório Institucional da UFRGS |
bitstream.url.fl_str_mv |
http://www.lume.ufrgs.br/bitstream/10183/109133/1/000381415.pdf http://www.lume.ufrgs.br/bitstream/10183/109133/2/000381415.pdf.txt http://www.lume.ufrgs.br/bitstream/10183/109133/3/000381415.pdf.jpg |
bitstream.checksum.fl_str_mv |
38d8de3324f74c23a953ead2b5da7586 b84aaf7eaa3b2a471629cad524530d02 30b05dd599e5a99638fa8f986b3cdbe4 |
bitstream.checksumAlgorithm.fl_str_mv |
MD5 MD5 MD5 |
repository.name.fl_str_mv |
Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS) |
repository.mail.fl_str_mv |
|
_version_ |
1801224862994268160 |