Magnetic field measurements of O stars with FORS 1 at the VLT

Autores
Hubrig, S.; Schöller, M.; Schnerr, R. S.; Gonzalez, Jorge Federico; Ignace, R.; Henrichs, H. F.
Año de publicación
2008
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Context. The presence of magnetic fields in O-type stars has heen suspected for a long time. The discovery of these fields would explain a wide range of well documented enigmatic phenomena in massive stars, in particular cyclical wind variability, Hα emission variations, chemical peculiarity, narrow X-ray emission lines, and non-thermal radio/X-ray emission. Aims. To investigate the incidence of magnetic fields in O stars, we acquired 38 new spectropolarimetric observations with FORS 1 (FOcal Reducer low dispersion Spectrograph) mounted on the 8-m Kueyen telescope of the VLT. Methods. Spectropolarimetric observations were obtained at different phases for a sample of 13 O stars. Ten stars were observed in the spectral range 348-589 nm, HD 36879 and HD 148937 were observed in the spectral region 325-621 nm, and HD 155806 was observed in both settings. To prove the feasibility of the FORS 1 spectropolarimetric mode for the measurements of magnetic fields in hot stars, we present in addition 12 FORS 1 observations of the mean longitudinal magnetic field in θ1 Ori C and compare them with measurements obtained with the MuSiCoS, ESPaDOnS, and Narval spectropolarimeters. Results. Most stars in our sample, which were observed on different nights, show a change of the magnetic field polarity, but a field at a significance level of 3σ was detected in only four stars, HD 36879, HD 148937, HD 152408, and HD 164794. The largest longitudinal magnetic field, 〈B〉 = -276 ± 88 G, was detected in the Of?p star HD 148937. We conclude that large-scale organized magnetic fields with polar field strengths larger than 1 kG are not widespread among O-type stars.
Fil: Hubrig, S.. European Southern Observatory Santiago; Chile
Fil: Schöller, M.. European Southern Observatory Santiago; Chile
Fil: Schnerr, R. S.. Sron Netherlands Institute For Space Research; Países Bajos. University of Amsterdam; Países Bajos
Fil: Gonzalez, Jorge Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Complejo Astronómico "El Leoncito". Universidad Nacional de Córdoba. Complejo Astronómico "El Leoncito". Universidad Nacional de la Plata. Complejo Astronómico "El Leoncito". Universidad Nacional de San Juan. Complejo Astronómico "El Leoncito"; Argentina
Fil: Ignace, R.. East Tennessee State University; Estados Unidos
Fil: Henrichs, H. F.. University of Amsterdam; Países Bajos
Materia
MAGNETIC FIELDS
POLARIZATION
STARS: ATMOSPNERES
STARS: EARLY-TYPE
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:11336/215284
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/215284
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Magnetic field measurements of O stars with FORS 1 at the VLTHubrig, S.Schöller, M.Schnerr, R. S.Gonzalez, Jorge FedericoIgnace, R.Henrichs, H. F.MAGNETIC FIELDSPOLARIZATIONSTARS: ATMOSPNERESSTARS: EARLY-TYPEhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Context. The presence of magnetic fields in O-type stars has heen suspected for a long time. The discovery of these fields would explain a wide range of well documented enigmatic phenomena in massive stars, in particular cyclical wind variability, Hα emission variations, chemical peculiarity, narrow X-ray emission lines, and non-thermal radio/X-ray emission. Aims. To investigate the incidence of magnetic fields in O stars, we acquired 38 new spectropolarimetric observations with FORS 1 (FOcal Reducer low dispersion Spectrograph) mounted on the 8-m Kueyen telescope of the VLT. Methods. Spectropolarimetric observations were obtained at different phases for a sample of 13 O stars. Ten stars were observed in the spectral range 348-589 nm, HD 36879 and HD 148937 were observed in the spectral region 325-621 nm, and HD 155806 was observed in both settings. To prove the feasibility of the FORS 1 spectropolarimetric mode for the measurements of magnetic fields in hot stars, we present in addition 12 FORS 1 observations of the mean longitudinal magnetic field in θ1 Ori C and compare them with measurements obtained with the MuSiCoS, ESPaDOnS, and Narval spectropolarimeters. Results. Most stars in our sample, which were observed on different nights, show a change of the magnetic field polarity, but a field at a significance level of 3σ was detected in only four stars, HD 36879, HD 148937, HD 152408, and HD 164794. The largest longitudinal magnetic field, 〈B〉 = -276 ± 88 G, was detected in the Of?p star HD 148937. We conclude that large-scale organized magnetic fields with polar field strengths larger than 1 kG are not widespread among O-type stars.Fil: Hubrig, S.. European Southern Observatory Santiago; ChileFil: Schöller, M.. European Southern Observatory Santiago; ChileFil: Schnerr, R. S.. Sron Netherlands Institute For Space Research; Países Bajos. University of Amsterdam; Países BajosFil: Gonzalez, Jorge Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Complejo Astronómico "El Leoncito". Universidad Nacional de Córdoba. Complejo Astronómico "El Leoncito". Universidad Nacional de la Plata. Complejo Astronómico "El Leoncito". Universidad Nacional de San Juan. Complejo Astronómico "El Leoncito"; ArgentinaFil: Ignace, R.. East Tennessee State University; Estados UnidosFil: Henrichs, H. F.. University of Amsterdam; Países BajosEDP Sciences2008-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/215284Hubrig, S.; Schöller, M.; Schnerr, R. S.; Gonzalez, Jorge Federico; Ignace, R.; et al.; Magnetic field measurements of O stars with FORS 1 at the VLT; EDP Sciences; Astronomy and Astrophysics; 490; 2; 12-2008; 793-8000004-6361CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:200810171info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2008/41/aa10171-08/aa10171-08.htmlinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T12:18:00Zoai:ri.conicet.gov.ar:11336/215284instacron: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:34982025-10-22 12:18:00.875CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Magnetic field measurements of O stars with FORS 1 at the VLT
title Magnetic field measurements of O stars with FORS 1 at the VLT
spellingShingle Magnetic field measurements of O stars with FORS 1 at the VLT
Hubrig, S.
MAGNETIC FIELDS
POLARIZATION
STARS: ATMOSPNERES
STARS: EARLY-TYPE
title_short Magnetic field measurements of O stars with FORS 1 at the VLT
title_full Magnetic field measurements of O stars with FORS 1 at the VLT
title_fullStr Magnetic field measurements of O stars with FORS 1 at the VLT
title_full_unstemmed Magnetic field measurements of O stars with FORS 1 at the VLT
title_sort Magnetic field measurements of O stars with FORS 1 at the VLT
dc.creator.none.fl_str_mv Hubrig, S.
Schöller, M.
Schnerr, R. S.
Gonzalez, Jorge Federico
Ignace, R.
Henrichs, H. F.
author Hubrig, S.
author_facet Hubrig, S.
Schöller, M.
Schnerr, R. S.
Gonzalez, Jorge Federico
Ignace, R.
Henrichs, H. F.
author_role author
author2 Schöller, M.
Schnerr, R. S.
Gonzalez, Jorge Federico
Ignace, R.
Henrichs, H. F.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv MAGNETIC FIELDS
POLARIZATION
STARS: ATMOSPNERES
STARS: EARLY-TYPE
topic MAGNETIC FIELDS
POLARIZATION
STARS: ATMOSPNERES
STARS: EARLY-TYPE
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Context. The presence of magnetic fields in O-type stars has heen suspected for a long time. The discovery of these fields would explain a wide range of well documented enigmatic phenomena in massive stars, in particular cyclical wind variability, Hα emission variations, chemical peculiarity, narrow X-ray emission lines, and non-thermal radio/X-ray emission. Aims. To investigate the incidence of magnetic fields in O stars, we acquired 38 new spectropolarimetric observations with FORS 1 (FOcal Reducer low dispersion Spectrograph) mounted on the 8-m Kueyen telescope of the VLT. Methods. Spectropolarimetric observations were obtained at different phases for a sample of 13 O stars. Ten stars were observed in the spectral range 348-589 nm, HD 36879 and HD 148937 were observed in the spectral region 325-621 nm, and HD 155806 was observed in both settings. To prove the feasibility of the FORS 1 spectropolarimetric mode for the measurements of magnetic fields in hot stars, we present in addition 12 FORS 1 observations of the mean longitudinal magnetic field in θ1 Ori C and compare them with measurements obtained with the MuSiCoS, ESPaDOnS, and Narval spectropolarimeters. Results. Most stars in our sample, which were observed on different nights, show a change of the magnetic field polarity, but a field at a significance level of 3σ was detected in only four stars, HD 36879, HD 148937, HD 152408, and HD 164794. The largest longitudinal magnetic field, 〈B〉 = -276 ± 88 G, was detected in the Of?p star HD 148937. We conclude that large-scale organized magnetic fields with polar field strengths larger than 1 kG are not widespread among O-type stars.
Fil: Hubrig, S.. European Southern Observatory Santiago; Chile
Fil: Schöller, M.. European Southern Observatory Santiago; Chile
Fil: Schnerr, R. S.. Sron Netherlands Institute For Space Research; Países Bajos. University of Amsterdam; Países Bajos
Fil: Gonzalez, Jorge Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Complejo Astronómico "El Leoncito". Universidad Nacional de Córdoba. Complejo Astronómico "El Leoncito". Universidad Nacional de la Plata. Complejo Astronómico "El Leoncito". Universidad Nacional de San Juan. Complejo Astronómico "El Leoncito"; Argentina
Fil: Ignace, R.. East Tennessee State University; Estados Unidos
Fil: Henrichs, H. F.. University of Amsterdam; Países Bajos
description Context. The presence of magnetic fields in O-type stars has heen suspected for a long time. The discovery of these fields would explain a wide range of well documented enigmatic phenomena in massive stars, in particular cyclical wind variability, Hα emission variations, chemical peculiarity, narrow X-ray emission lines, and non-thermal radio/X-ray emission. Aims. To investigate the incidence of magnetic fields in O stars, we acquired 38 new spectropolarimetric observations with FORS 1 (FOcal Reducer low dispersion Spectrograph) mounted on the 8-m Kueyen telescope of the VLT. Methods. Spectropolarimetric observations were obtained at different phases for a sample of 13 O stars. Ten stars were observed in the spectral range 348-589 nm, HD 36879 and HD 148937 were observed in the spectral region 325-621 nm, and HD 155806 was observed in both settings. To prove the feasibility of the FORS 1 spectropolarimetric mode for the measurements of magnetic fields in hot stars, we present in addition 12 FORS 1 observations of the mean longitudinal magnetic field in θ1 Ori C and compare them with measurements obtained with the MuSiCoS, ESPaDOnS, and Narval spectropolarimeters. Results. Most stars in our sample, which were observed on different nights, show a change of the magnetic field polarity, but a field at a significance level of 3σ was detected in only four stars, HD 36879, HD 148937, HD 152408, and HD 164794. The largest longitudinal magnetic field, 〈B〉 = -276 ± 88 G, was detected in the Of?p star HD 148937. We conclude that large-scale organized magnetic fields with polar field strengths larger than 1 kG are not widespread among O-type stars.
publishDate 2008
dc.date.none.fl_str_mv 2008-12
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/11336/215284
Hubrig, S.; Schöller, M.; Schnerr, R. S.; Gonzalez, Jorge Federico; Ignace, R.; et al.; Magnetic field measurements of O stars with FORS 1 at the VLT; EDP Sciences; Astronomy and Astrophysics; 490; 2; 12-2008; 793-800
0004-6361
CONICET Digital
CONICET
url http://hdl.handle.net/11336/215284
identifier_str_mv Hubrig, S.; Schöller, M.; Schnerr, R. S.; Gonzalez, Jorge Federico; Ignace, R.; et al.; Magnetic field measurements of O stars with FORS 1 at the VLT; EDP Sciences; Astronomy and Astrophysics; 490; 2; 12-2008; 793-800
0004-6361
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:200810171
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2008/41/aa10171-08/aa10171-08.html
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 EDP Sciences
publisher.none.fl_str_mv EDP Sciences
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 12.982451

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