NGC 1624-2: a slowly rotating, X-ray luminous Of?cp star with an extraordinarily strong magnetic field

Autores
Wade, G. A.; Maíz Apellaniz, J.; Martins, F.; Petit, V.; Grunhut, J.; Walborn, N. R.; Barba, Rodolfo Hector; Gagné, M.; García Melendo, E.; Jose, J.; Moffat, A. F. J.; Naze, Y.; Neiner, C.; Pellerin, A.; Penades Ordaz, M.; Shultz, M.; Simon Díaz, S.; Sota, A.; MiMeS Collaboration
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
This paper presents a first observational investigation of the faint Of?p star NGC 1624-2, yielding important new constraints on its spectral and physical characteristics, rotation, magnetic field strength, X-ray emission and magnetospheric properties. Modelling the spectrum and spectral energy distribution, we conclude that NGC 1624-2 is a main-sequence star of mass M ≃ 30 Msun, and infer an effective temperature of 35 ± 2 kK and log g = 4.0 ± 0.2. Based on an extensive time series of optical spectral observations we report significant variability of a large number of spectral lines, and infer a unique period of 157.99 ± 0.94 d which we interpret as the rotational period of the star. We report the detection of a very strong (5.35 ± 0.5 kG) longitudinal magnetic field , coupled with probable Zeeman splitting of the Stokes I profiles of metal lines confirming a surface field modulus of 14 ± 1 kG, consistent with a surface dipole of polar strength ≳20 kG. This is the largest magnetic field ever detected in an O-type star, and the first report of Zeeman splitting of Stokes I profiles in such an object. We also report the detection of reversed Stokes V profiles associated with weak, high-excitation emission lines of O III, which we propose may form in the close magnetosphere of the star. We analyse archival Chandra ACIS-I X-ray data, inferring a very hard spectrum with an X-ray efficiency of log Lx/Lbol = -6.4, a factor of 4 larger than the canonical value for O-type stars and comparable to that of the young magnetic O-type star θ1 Ori C and other Of?p stars. Finally, we examine the probable magnetospheric properties of the star, reporting in particular very strong magnetic confinement of the stellar wind, with η* ≃ 1.5 × 104, and a very large Alfvén radius, RAlf = 11.4 R*.
Fil: Wade, G. A.. Royal Military College of Canada. Department of Physics; Canadá
Fil: Maíz Apellaniz, J.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España
Fil: Martins, F.. Universite Montpellier Ii; Francia
Fil: Petit, V.. West Chester University. Department of Geology & Astronomy; Estados Unidos
Fil: Grunhut, J.. Royal Military College of Canada. Department of Physics; Canadá
Fil: Walborn, N. R.. Space Telescope Science Institute; Estados Unidos
Fil: Barba, Rodolfo Hector. Consejo Nacional de Investigaciones Cienti­ficas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; Argentina
Fil: Gagné, M. . West Chester University. Department of Geology & Astronomy; Estados Unidos
Fil: García Melendo, E.. Fundacio Privada Observatori Esteve Duran; España. Consejo Superior de Investigaciones Científicas. Institut de Ciencies de l’Espai; España
Fil: Jose, J.. Indian Institute of Astrophysics; India
Fil: Moffat, A. F. J.. University Of Montreal; Canadá
Fil: Naze, Y.. Universite de Liege; Bélgica
Fil: Neiner, C.. Universite Paris Diderot - Paris 7; Francia
Fil: Pellerin, A.. Texas A&M University. Department of Physics and Astronomy; Estados Unidos
Fil: Penades Ordaz, M.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España
Fil: Shultz, M.. Royal Military College of Canada. Department of Physics; Canadá
Fil: Simon Díaz, S.. Instituto de Astrofisica de Canarias; España
Fil: Sota, A.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España
Fil: MiMeS Collaboration.
Materia
BINARIES: SPECTROSCOPIC
EARLY-TYPE STARS
STARS: MAGNETIC FIELDS
STARS: NGC1624-2
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/6636
Acceder
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network_name_str CONICET Digital (CONICET)
spelling NGC 1624-2: a slowly rotating, X-ray luminous Of?cp star with an extraordinarily strong magnetic fieldWade, G. A.Maíz Apellaniz, J.Martins, F.Petit, V.Grunhut, J.Walborn, N. R.Barba, Rodolfo HectorGagné, M. García Melendo, E.Jose, J.Moffat, A. F. J.Naze, Y.Neiner, C.Pellerin, A.Penades Ordaz, M.Shultz, M.Simon Díaz, S.Sota, A.MiMeS CollaborationBINARIES: SPECTROSCOPICEARLY-TYPE STARSSTARS: MAGNETIC FIELDSSTARS: NGC1624-2https://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1This paper presents a first observational investigation of the faint Of?p star NGC 1624-2, yielding important new constraints on its spectral and physical characteristics, rotation, magnetic field strength, X-ray emission and magnetospheric properties. Modelling the spectrum and spectral energy distribution, we conclude that NGC 1624-2 is a main-sequence star of mass M ≃ 30 Msun, and infer an effective temperature of 35 ± 2 kK and log g = 4.0 ± 0.2. Based on an extensive time series of optical spectral observations we report significant variability of a large number of spectral lines, and infer a unique period of 157.99 ± 0.94 d which we interpret as the rotational period of the star. We report the detection of a very strong (5.35 ± 0.5 kG) longitudinal magnetic field <Bz>, coupled with probable Zeeman splitting of the Stokes I profiles of metal lines confirming a surface field modulus of 14 ± 1 kG, consistent with a surface dipole of polar strength ≳20 kG. This is the largest magnetic field ever detected in an O-type star, and the first report of Zeeman splitting of Stokes I profiles in such an object. We also report the detection of reversed Stokes V profiles associated with weak, high-excitation emission lines of O III, which we propose may form in the close magnetosphere of the star. We analyse archival Chandra ACIS-I X-ray data, inferring a very hard spectrum with an X-ray efficiency of log Lx/Lbol = -6.4, a factor of 4 larger than the canonical value for O-type stars and comparable to that of the young magnetic O-type star θ1 Ori C and other Of?p stars. Finally, we examine the probable magnetospheric properties of the star, reporting in particular very strong magnetic confinement of the stellar wind, with η* ≃ 1.5 × 104, and a very large Alfvén radius, RAlf = 11.4 R*.Fil: Wade, G. A.. Royal Military College of Canada. Department of Physics; CanadáFil: Maíz Apellaniz, J.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; EspañaFil: Martins, F.. Universite Montpellier Ii; FranciaFil: Petit, V.. West Chester University. Department of Geology & Astronomy; Estados UnidosFil: Grunhut, J.. Royal Military College of Canada. Department of Physics; CanadáFil: Walborn, N. R.. Space Telescope Science Institute; Estados UnidosFil: Barba, Rodolfo Hector. Consejo Nacional de Investigaciones Cienti­ficas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; ArgentinaFil: Gagné, M. . West Chester University. Department of Geology & Astronomy; Estados UnidosFil: García Melendo, E.. Fundacio Privada Observatori Esteve Duran; España. Consejo Superior de Investigaciones Científicas. Institut de Ciencies de l’Espai; EspañaFil: Jose, J.. Indian Institute of Astrophysics; IndiaFil: Moffat, A. F. J.. University Of Montreal; CanadáFil: Naze, Y.. Universite de Liege; BélgicaFil: Neiner, C.. Universite Paris Diderot - Paris 7; FranciaFil: Pellerin, A.. Texas A&M University. Department of Physics and Astronomy; Estados UnidosFil: Penades Ordaz, M.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; EspañaFil: Shultz, M.. Royal Military College of Canada. Department of Physics; CanadáFil: Simon Díaz, S.. Instituto de Astrofisica de Canarias; EspañaFil: Sota, A.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; EspañaFil: MiMeS Collaboration.Oxford University Press2012-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/6636Wade, G. A.; Maíz Apellaniz, J.; Martins, F.; Petit, V.; Grunhut, J.; et al.; NGC 1624-2: a slowly rotating, X-ray luminous Of?cp star with an extraordinarily strong magnetic field; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 425; 2; 9-2012; 1278-12930035-8711enginfo:eu-repo/semantics/altIdentifier/url/http://mnras.oxfordjournals.org/content/425/2/1278info:eu-repo/semantics/altIdentifier/arxiv/1206.2834v3info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1206.2834v3info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2012.21523.xinfo:eu-repo/semantics/altIdentifier/doi/info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-11-12T09:36:05Zoai:ri.conicet.gov.ar:11336/6636instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-11-12 09:36:05.79CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv NGC 1624-2: a slowly rotating, X-ray luminous Of?cp star with an extraordinarily strong magnetic field
title NGC 1624-2: a slowly rotating, X-ray luminous Of?cp star with an extraordinarily strong magnetic field
spellingShingle NGC 1624-2: a slowly rotating, X-ray luminous Of?cp star with an extraordinarily strong magnetic field
Wade, G. A.
BINARIES: SPECTROSCOPIC
EARLY-TYPE STARS
STARS: MAGNETIC FIELDS
STARS: NGC1624-2
title_short NGC 1624-2: a slowly rotating, X-ray luminous Of?cp star with an extraordinarily strong magnetic field
title_full NGC 1624-2: a slowly rotating, X-ray luminous Of?cp star with an extraordinarily strong magnetic field
title_fullStr NGC 1624-2: a slowly rotating, X-ray luminous Of?cp star with an extraordinarily strong magnetic field
title_full_unstemmed NGC 1624-2: a slowly rotating, X-ray luminous Of?cp star with an extraordinarily strong magnetic field
title_sort NGC 1624-2: a slowly rotating, X-ray luminous Of?cp star with an extraordinarily strong magnetic field
dc.creator.none.fl_str_mv Wade, G. A.
Maíz Apellaniz, J.
Martins, F.
Petit, V.
Grunhut, J.
Walborn, N. R.
Barba, Rodolfo Hector
Gagné, M.
García Melendo, E.
Jose, J.
Moffat, A. F. J.
Naze, Y.
Neiner, C.
Pellerin, A.
Penades Ordaz, M.
Shultz, M.
Simon Díaz, S.
Sota, A.
MiMeS Collaboration
author Wade, G. A.
author_facet Wade, G. A.
Maíz Apellaniz, J.
Martins, F.
Petit, V.
Grunhut, J.
Walborn, N. R.
Barba, Rodolfo Hector
Gagné, M.
García Melendo, E.
Jose, J.
Moffat, A. F. J.
Naze, Y.
Neiner, C.
Pellerin, A.
Penades Ordaz, M.
Shultz, M.
Simon Díaz, S.
Sota, A.
MiMeS Collaboration
author_role author
author2 Maíz Apellaniz, J.
Martins, F.
Petit, V.
Grunhut, J.
Walborn, N. R.
Barba, Rodolfo Hector
Gagné, M.
García Melendo, E.
Jose, J.
Moffat, A. F. J.
Naze, Y.
Neiner, C.
Pellerin, A.
Penades Ordaz, M.
Shultz, M.
Simon Díaz, S.
Sota, A.
MiMeS Collaboration
author2_role author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv BINARIES: SPECTROSCOPIC
EARLY-TYPE STARS
STARS: MAGNETIC FIELDS
STARS: NGC1624-2
topic BINARIES: SPECTROSCOPIC
EARLY-TYPE STARS
STARS: MAGNETIC FIELDS
STARS: NGC1624-2
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv This paper presents a first observational investigation of the faint Of?p star NGC 1624-2, yielding important new constraints on its spectral and physical characteristics, rotation, magnetic field strength, X-ray emission and magnetospheric properties. Modelling the spectrum and spectral energy distribution, we conclude that NGC 1624-2 is a main-sequence star of mass M ≃ 30 Msun, and infer an effective temperature of 35 ± 2 kK and log g = 4.0 ± 0.2. Based on an extensive time series of optical spectral observations we report significant variability of a large number of spectral lines, and infer a unique period of 157.99 ± 0.94 d which we interpret as the rotational period of the star. We report the detection of a very strong (5.35 ± 0.5 kG) longitudinal magnetic field <Bz>, coupled with probable Zeeman splitting of the Stokes I profiles of metal lines confirming a surface field modulus of 14 ± 1 kG, consistent with a surface dipole of polar strength ≳20 kG. This is the largest magnetic field ever detected in an O-type star, and the first report of Zeeman splitting of Stokes I profiles in such an object. We also report the detection of reversed Stokes V profiles associated with weak, high-excitation emission lines of O III, which we propose may form in the close magnetosphere of the star. We analyse archival Chandra ACIS-I X-ray data, inferring a very hard spectrum with an X-ray efficiency of log Lx/Lbol = -6.4, a factor of 4 larger than the canonical value for O-type stars and comparable to that of the young magnetic O-type star θ1 Ori C and other Of?p stars. Finally, we examine the probable magnetospheric properties of the star, reporting in particular very strong magnetic confinement of the stellar wind, with η* ≃ 1.5 × 104, and a very large Alfvén radius, RAlf = 11.4 R*.
Fil: Wade, G. A.. Royal Military College of Canada. Department of Physics; Canadá
Fil: Maíz Apellaniz, J.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España
Fil: Martins, F.. Universite Montpellier Ii; Francia
Fil: Petit, V.. West Chester University. Department of Geology & Astronomy; Estados Unidos
Fil: Grunhut, J.. Royal Military College of Canada. Department of Physics; Canadá
Fil: Walborn, N. R.. Space Telescope Science Institute; Estados Unidos
Fil: Barba, Rodolfo Hector. Consejo Nacional de Investigaciones Cienti­ficas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; Argentina
Fil: Gagné, M. . West Chester University. Department of Geology & Astronomy; Estados Unidos
Fil: García Melendo, E.. Fundacio Privada Observatori Esteve Duran; España. Consejo Superior de Investigaciones Científicas. Institut de Ciencies de l’Espai; España
Fil: Jose, J.. Indian Institute of Astrophysics; India
Fil: Moffat, A. F. J.. University Of Montreal; Canadá
Fil: Naze, Y.. Universite de Liege; Bélgica
Fil: Neiner, C.. Universite Paris Diderot - Paris 7; Francia
Fil: Pellerin, A.. Texas A&M University. Department of Physics and Astronomy; Estados Unidos
Fil: Penades Ordaz, M.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España
Fil: Shultz, M.. Royal Military College of Canada. Department of Physics; Canadá
Fil: Simon Díaz, S.. Instituto de Astrofisica de Canarias; España
Fil: Sota, A.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España
Fil: MiMeS Collaboration.
description This paper presents a first observational investigation of the faint Of?p star NGC 1624-2, yielding important new constraints on its spectral and physical characteristics, rotation, magnetic field strength, X-ray emission and magnetospheric properties. Modelling the spectrum and spectral energy distribution, we conclude that NGC 1624-2 is a main-sequence star of mass M ≃ 30 Msun, and infer an effective temperature of 35 ± 2 kK and log g = 4.0 ± 0.2. Based on an extensive time series of optical spectral observations we report significant variability of a large number of spectral lines, and infer a unique period of 157.99 ± 0.94 d which we interpret as the rotational period of the star. We report the detection of a very strong (5.35 ± 0.5 kG) longitudinal magnetic field <Bz>, coupled with probable Zeeman splitting of the Stokes I profiles of metal lines confirming a surface field modulus of 14 ± 1 kG, consistent with a surface dipole of polar strength ≳20 kG. This is the largest magnetic field ever detected in an O-type star, and the first report of Zeeman splitting of Stokes I profiles in such an object. We also report the detection of reversed Stokes V profiles associated with weak, high-excitation emission lines of O III, which we propose may form in the close magnetosphere of the star. We analyse archival Chandra ACIS-I X-ray data, inferring a very hard spectrum with an X-ray efficiency of log Lx/Lbol = -6.4, a factor of 4 larger than the canonical value for O-type stars and comparable to that of the young magnetic O-type star θ1 Ori C and other Of?p stars. Finally, we examine the probable magnetospheric properties of the star, reporting in particular very strong magnetic confinement of the stellar wind, with η* ≃ 1.5 × 104, and a very large Alfvén radius, RAlf = 11.4 R*.
publishDate 2012
dc.date.none.fl_str_mv 2012-09
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/6636
Wade, G. A.; Maíz Apellaniz, J.; Martins, F.; Petit, V.; Grunhut, J.; et al.; NGC 1624-2: a slowly rotating, X-ray luminous Of?cp star with an extraordinarily strong magnetic field; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 425; 2; 9-2012; 1278-1293
0035-8711
url http://hdl.handle.net/11336/6636
identifier_str_mv Wade, G. A.; Maíz Apellaniz, J.; Martins, F.; Petit, V.; Grunhut, J.; et al.; NGC 1624-2: a slowly rotating, X-ray luminous Of?cp star with an extraordinarily strong magnetic field; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 425; 2; 9-2012; 1278-1293
0035-8711
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://mnras.oxfordjournals.org/content/425/2/1278
info:eu-repo/semantics/altIdentifier/arxiv/1206.2834v3
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1206.2834v3
info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2012.21523.x
info:eu-repo/semantics/altIdentifier/doi/
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.25334

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