Spectroscopic variabilities in lambda Pavonis

Aims. We investigate the time-varying patterns in line profiles, V/R, and radial velocity of the Be star HD 173948 (lambda Pavonis).Methods. Time series analyses of radial velocity, V/R, and line profiles of He I, Fe II, and Si II were performed with the Cleanest algorithm. An estimate of the stella...

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Detalles Bibliográficos
Autores: Levenhagen, Ronaldo Savarino [UNIFESP], Leister, N. V., Kuenzel, R.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2011
País:Brasil
Institución:Universidade Federal de São Paulo (UNIFESP)
Repositorio:Repositório Institucional da UNIFESP
Idioma:inglés
OAI Identifier:oai:repositorio.unifesp.br:11600/33976
Acceso en línea:http://dx.doi.org/10.1051/0004-6361/201116590
http://repositorio.unifesp.br/handle/11600/33976
Access Level:acceso abierto
Palabra clave:stars: oscillations
stars: fundamental parameters
stars: emission-line, Be
stars: individual: lambda Pavonis
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repository_id_str
spelling Spectroscopic variabilities in lambda Pavonisstars: oscillationsstars: fundamental parametersstars: emission-line, Bestars: individual: lambda PavonisAims. We investigate the time-varying patterns in line profiles, V/R, and radial velocity of the Be star HD 173948 (lambda Pavonis).Methods. Time series analyses of radial velocity, V/R, and line profiles of He I, Fe II, and Si II were performed with the Cleanest algorithm. An estimate of the stellar rotation frequency was derived from the stellar mass and radius in the Roche limit by adopting an aspect angle i derived from the fittings of non-LTE model spectra affected by rotation. the projected rotation velocity, necessary as input for the spectral synthesis procedure, was evaluated from the Fourier transform of the rotation profiles of all neutral helium lines in the optical range.Results. Emission episodes in Balmer and He i lines, as well as V/R cyclic variations, are reported for spectra observed in year 1999, followed by a relatively quiescent phase (2000) and then again a new active epoch (2001). From time series analyses of line profiles, radial velocities, and V/R ratios, four signals with high confidence levels are detected: nu(1) = 0.17 +/- 0.02, nu(2) = 0.49 +/- 0.05, nu(3) = 0.82 +/- 0.03, and nu(4) = 1.63 +/- 0.04 c/d. We interpret nu 4 as a non-radial pulsation g-mode, nu 3 as a signal related to the orbital timescale of ejected material, which is near the theoretical rotation frequency 0.81 c/d inferred from the fitting of the models taken into account for gravity darkening. the signals nu(1) and nu(2) are viewed as aliases of nu(3) and nu(4).Universidade Federal de São Paulo, Dept Ciencias Exatas & Terra, BR-09972270 Diadema, SP, BrazilUniv São Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508900 São Paulo, BrazilUniv São Paulo, Inst Fis, BR-05508900 São Paulo, BrazilUniversidade Federal de São Paulo, Dept Ciencias Exatas & Terra, BR-09972270 Diadema, SP, BrazilWeb of ScienceFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)FAPESP: 04/14256-8FAPESP: 2010/06814-4CNPq: 307095/2008-8CNPq: 1998/10138-8Edp Sciences S AUniversidade Federal de São Paulo (UNIFESP)Universidade de São Paulo (USP)2016-01-24T14:17:07Z2016-01-24T14:17:07Z2011-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion8http://dx.doi.org/10.1051/0004-6361/201116590Astronomy & Astrophysics. Les Ulis Cedex A: Edp Sciences S A, v. 533, 8 p., 2011.10.1051/0004-6361/2011165900004-6361http://repositorio.unifesp.br/handle/11600/33976WOS:000295168100075ark:/48912/001300001jchjengAstronomy & Astrophysicsinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UNIFESPinstname:Universidade Federal de São Paulo (UNIFESP)instacron:UNIFESPLevenhagen, Ronaldo Savarino [UNIFESP]Leister, N. V.Kuenzel, R.2022-06-02T10:24:19Zoai:repositorio.unifesp.br:11600/33976Repositório InstitucionalPUBhttp://www.repositorio.unifesp.br/oai/requestbiblioteca.csp@unifesp.bropendoar:34652022-06-02T10:24:19Repositório Institucional da UNIFESP - Universidade Federal de São Paulo (UNIFESP)false
dc.title.none.fl_str_mv Spectroscopic variabilities in lambda Pavonis
title Spectroscopic variabilities in lambda Pavonis
spellingShingle Spectroscopic variabilities in lambda Pavonis
Levenhagen, Ronaldo Savarino [UNIFESP]
stars: oscillations
stars: fundamental parameters
stars: emission-line, Be
stars: individual: lambda Pavonis
title_short Spectroscopic variabilities in lambda Pavonis
title_full Spectroscopic variabilities in lambda Pavonis
title_fullStr Spectroscopic variabilities in lambda Pavonis
title_full_unstemmed Spectroscopic variabilities in lambda Pavonis
title_sort Spectroscopic variabilities in lambda Pavonis
dc.creator.none.fl_str_mv Levenhagen, Ronaldo Savarino [UNIFESP]
Leister, N. V.
Kuenzel, R.
author Levenhagen, Ronaldo Savarino [UNIFESP]
author_facet Levenhagen, Ronaldo Savarino [UNIFESP]
Leister, N. V.
Kuenzel, R.
author_role author
author2 Leister, N. V.
Kuenzel, R.
author2_role author
author
dc.contributor.none.fl_str_mv Universidade Federal de São Paulo (UNIFESP)
Universidade de São Paulo (USP)
dc.subject.por.fl_str_mv stars: oscillations
stars: fundamental parameters
stars: emission-line, Be
stars: individual: lambda Pavonis
topic stars: oscillations
stars: fundamental parameters
stars: emission-line, Be
stars: individual: lambda Pavonis
description Aims. We investigate the time-varying patterns in line profiles, V/R, and radial velocity of the Be star HD 173948 (lambda Pavonis).Methods. Time series analyses of radial velocity, V/R, and line profiles of He I, Fe II, and Si II were performed with the Cleanest algorithm. An estimate of the stellar rotation frequency was derived from the stellar mass and radius in the Roche limit by adopting an aspect angle i derived from the fittings of non-LTE model spectra affected by rotation. the projected rotation velocity, necessary as input for the spectral synthesis procedure, was evaluated from the Fourier transform of the rotation profiles of all neutral helium lines in the optical range.Results. Emission episodes in Balmer and He i lines, as well as V/R cyclic variations, are reported for spectra observed in year 1999, followed by a relatively quiescent phase (2000) and then again a new active epoch (2001). From time series analyses of line profiles, radial velocities, and V/R ratios, four signals with high confidence levels are detected: nu(1) = 0.17 +/- 0.02, nu(2) = 0.49 +/- 0.05, nu(3) = 0.82 +/- 0.03, and nu(4) = 1.63 +/- 0.04 c/d. We interpret nu 4 as a non-radial pulsation g-mode, nu 3 as a signal related to the orbital timescale of ejected material, which is near the theoretical rotation frequency 0.81 c/d inferred from the fitting of the models taken into account for gravity darkening. the signals nu(1) and nu(2) are viewed as aliases of nu(3) and nu(4).
publishDate 2011
dc.date.none.fl_str_mv 2011-09-01
2016-01-24T14:17:07Z
2016-01-24T14:17:07Z
dc.type.driver.fl_str_mv 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://dx.doi.org/10.1051/0004-6361/201116590
Astronomy & Astrophysics. Les Ulis Cedex A: Edp Sciences S A, v. 533, 8 p., 2011.
10.1051/0004-6361/201116590
0004-6361
http://repositorio.unifesp.br/handle/11600/33976
WOS:000295168100075
dc.identifier.dark.fl_str_mv ark:/48912/001300001jchj
url http://dx.doi.org/10.1051/0004-6361/201116590
http://repositorio.unifesp.br/handle/11600/33976
identifier_str_mv Astronomy & Astrophysics. Les Ulis Cedex A: Edp Sciences S A, v. 533, 8 p., 2011.
10.1051/0004-6361/201116590
0004-6361
WOS:000295168100075
ark:/48912/001300001jchj
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Astronomy & Astrophysics
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 8
dc.publisher.none.fl_str_mv Edp Sciences S A
publisher.none.fl_str_mv Edp Sciences S A
dc.source.none.fl_str_mv reponame:Repositório Institucional da UNIFESP
instname:Universidade Federal de São Paulo (UNIFESP)
instacron:UNIFESP
instname_str Universidade Federal de São Paulo (UNIFESP)
instacron_str UNIFESP
institution UNIFESP
reponame_str Repositório Institucional da UNIFESP
collection Repositório Institucional da UNIFESP
repository.name.fl_str_mv Repositório Institucional da UNIFESP - Universidade Federal de São Paulo (UNIFESP)
repository.mail.fl_str_mv biblioteca.csp@unifesp.br
_version_ 1853670458532036608
score 15.301603

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