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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/215284
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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 Técnicas2025-09-29T10:44:46Zoai: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:34982025-09-29 10:44:47.112CONICET 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 |
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CONICET Digital (CONICET) |
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CONICET Digital (CONICET) |
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Consejo Nacional de Investigaciones Científicas y Técnicas |
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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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13.070432 |