The Onfp class in the Magellanic Clouds

Autores
Walborn, Nolan R.; Howarth, Ian D.; Evans, Christopher J.; Crowther, Paul A.; Moffat, Anthony F. J.; St Louis, Nicole; Fariña, Cecilia; Bosch, Guillermo Luis; Morrell, Nidia Irene; Barba, Rodolfo Hector; van Loon, Jacco Th.
Año de publicación
2010
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The Onfp class of rotationally broadened, hot spectra was defined some time ago in the Galaxy, where its membership to date numbers only eight. The principal defining characteristic is a broad, centrally reversed He ii λ 4686 emission profile; other emission and absorption lines are also rotationally broadened. Recent surveys in the Magellanic Clouds (MCs) have brought the class membership there, including some related spectra, to 28. We present a survey of the spectral morphology and rotational velocities, as a first step toward elucidating the nature of this class. Evolved, rapidly rotating hot stars are not expected theoretically, because the stellar winds should brake the rotation. Luminosity classification of these spectra is not possible, because the principal criterion (He ii λ4686) is peculiar; however, the MCs provide reliable absolute magnitudes, which show that they span the entire range from dwarfs to supergiants. The Onfp line-broadening distribution is distinct and shifted toward larger values from those of normal O dwarfs and supergiants with >99.99% confidence. All cases with multiple observations show line-profile variations, which even remove some objects from the class temporarily. Some of them are spectroscopic binaries; it is possible that the peculiar profiles may have multiple causes among different objects. The origin and future of these stars are intriguing; for instance, they could be stellar mergers and/or gamma-ray-burst progenitors.
Fil: Walborn, Nolan R.. Space Telescope Science Institute; Estados Unidos
Fil: Howarth, Ian D.. University College London; Estados Unidos
Fil: Evans, Christopher J.. Royal Observatory Edinburgh. Astronomy Technology Centre; Reino Unido
Fil: Crowther, Paul A.. University of Sheffield. Department of Physics and Astronomy; Reino Unido
Fil: Moffat, Anthony F. J.. University Of Montreal; Canadá
Fil: St Louis, Nicole. University Of Montreal; Canadá
Fil: Fariña, Cecilia. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina
Fil: Bosch, Guillermo Luis. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina
Fil: Morrell, Nidia Irene. Observatorio Las Campanas; Chile
Fil: Barba, Rodolfo Hector. Universidad de la Serena. Facultad de Ciencias; Chile. Consejo Nacional de Investigaciones Cienti­ficas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; Argentina
Fil: van Loon, Jacco Th.. Keele University. School of Physical & Geographical Sciences; Reino Unido
Materia
Magellanic Clouds, stars: early-type
Stars emission-line
Stars fundamental parameters
Stars rotation
Stars: variables
Be
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:11336/9568
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/9568
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling The Onfp class in the Magellanic CloudsWalborn, Nolan R.Howarth, Ian D.Evans, Christopher J.Crowther, Paul A.Moffat, Anthony F. J.St Louis, NicoleFariña, CeciliaBosch, Guillermo LuisMorrell, Nidia IreneBarba, Rodolfo Hectorvan Loon, Jacco Th.Magellanic Clouds, stars: early-typeStars emission-lineStars fundamental parametersStars rotationStars: variablesBehttps://purl.org/becyt/ford/1.7https://purl.org/becyt/ford/1https://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1The Onfp class of rotationally broadened, hot spectra was defined some time ago in the Galaxy, where its membership to date numbers only eight. The principal defining characteristic is a broad, centrally reversed He ii λ 4686 emission profile; other emission and absorption lines are also rotationally broadened. Recent surveys in the Magellanic Clouds (MCs) have brought the class membership there, including some related spectra, to 28. We present a survey of the spectral morphology and rotational velocities, as a first step toward elucidating the nature of this class. Evolved, rapidly rotating hot stars are not expected theoretically, because the stellar winds should brake the rotation. Luminosity classification of these spectra is not possible, because the principal criterion (He ii λ4686) is peculiar; however, the MCs provide reliable absolute magnitudes, which show that they span the entire range from dwarfs to supergiants. The Onfp line-broadening distribution is distinct and shifted toward larger values from those of normal O dwarfs and supergiants with >99.99% confidence. All cases with multiple observations show line-profile variations, which even remove some objects from the class temporarily. Some of them are spectroscopic binaries; it is possible that the peculiar profiles may have multiple causes among different objects. The origin and future of these stars are intriguing; for instance, they could be stellar mergers and/or gamma-ray-burst progenitors.Fil: Walborn, Nolan R.. Space Telescope Science Institute; Estados UnidosFil: Howarth, Ian D.. University College London; Estados UnidosFil: Evans, Christopher J.. Royal Observatory Edinburgh. Astronomy Technology Centre; Reino UnidoFil: Crowther, Paul A.. University of Sheffield. Department of Physics and Astronomy; Reino UnidoFil: Moffat, Anthony F. J.. University Of Montreal; CanadáFil: St Louis, Nicole. University Of Montreal; CanadáFil: Fariña, Cecilia. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; ArgentinaFil: Bosch, Guillermo Luis. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; ArgentinaFil: Morrell, Nidia Irene. Observatorio Las Campanas; ChileFil: Barba, Rodolfo Hector. Universidad de la Serena. Facultad de Ciencias; Chile. Consejo Nacional de Investigaciones Cienti­ficas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; ArgentinaFil: van Loon, Jacco Th.. Keele University. School of Physical & Geographical Sciences; Reino UnidoIop Publishing2010-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/9568Walborn, Nolan R.; Howarth, Ian D.; Evans, Christopher J.; Crowther, Paul A.; Moffat, Anthony F. J.; et al.; The Onfp class in the Magellanic Clouds; Iop Publishing; Astronomical Journal; 139; 3-2010; 1283-12940004-6256enginfo:eu-repo/semantics/altIdentifier/url/http://adsabs.harvard.edu/abs/2010AJ....139.1283Winfo:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1001.4032info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0004-6256/139/3/1283/metainfo:eu-repo/semantics/altIdentifier/doi/10.1088/0004-6256/139/3/1283info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:37:46Zoai:ri.conicet.gov.ar:11336/9568instacron: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 09:37:47.01CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The Onfp class in the Magellanic Clouds
title The Onfp class in the Magellanic Clouds
spellingShingle The Onfp class in the Magellanic Clouds
Walborn, Nolan R.
Magellanic Clouds, stars: early-type
Stars emission-line
Stars fundamental parameters
Stars rotation
Stars: variables
Be
title_short The Onfp class in the Magellanic Clouds
title_full The Onfp class in the Magellanic Clouds
title_fullStr The Onfp class in the Magellanic Clouds
title_full_unstemmed The Onfp class in the Magellanic Clouds
title_sort The Onfp class in the Magellanic Clouds
dc.creator.none.fl_str_mv Walborn, Nolan R.
Howarth, Ian D.
Evans, Christopher J.
Crowther, Paul A.
Moffat, Anthony F. J.
St Louis, Nicole
Fariña, Cecilia
Bosch, Guillermo Luis
Morrell, Nidia Irene
Barba, Rodolfo Hector
van Loon, Jacco Th.
author Walborn, Nolan R.
author_facet Walborn, Nolan R.
Howarth, Ian D.
Evans, Christopher J.
Crowther, Paul A.
Moffat, Anthony F. J.
St Louis, Nicole
Fariña, Cecilia
Bosch, Guillermo Luis
Morrell, Nidia Irene
Barba, Rodolfo Hector
van Loon, Jacco Th.
author_role author
author2 Howarth, Ian D.
Evans, Christopher J.
Crowther, Paul A.
Moffat, Anthony F. J.
St Louis, Nicole
Fariña, Cecilia
Bosch, Guillermo Luis
Morrell, Nidia Irene
Barba, Rodolfo Hector
van Loon, Jacco Th.
author2_role author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Magellanic Clouds, stars: early-type
Stars emission-line
Stars fundamental parameters
Stars rotation
Stars: variables
Be
topic Magellanic Clouds, stars: early-type
Stars emission-line
Stars fundamental parameters
Stars rotation
Stars: variables
Be
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.7
https://purl.org/becyt/ford/1
https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The Onfp class of rotationally broadened, hot spectra was defined some time ago in the Galaxy, where its membership to date numbers only eight. The principal defining characteristic is a broad, centrally reversed He ii λ 4686 emission profile; other emission and absorption lines are also rotationally broadened. Recent surveys in the Magellanic Clouds (MCs) have brought the class membership there, including some related spectra, to 28. We present a survey of the spectral morphology and rotational velocities, as a first step toward elucidating the nature of this class. Evolved, rapidly rotating hot stars are not expected theoretically, because the stellar winds should brake the rotation. Luminosity classification of these spectra is not possible, because the principal criterion (He ii λ4686) is peculiar; however, the MCs provide reliable absolute magnitudes, which show that they span the entire range from dwarfs to supergiants. The Onfp line-broadening distribution is distinct and shifted toward larger values from those of normal O dwarfs and supergiants with >99.99% confidence. All cases with multiple observations show line-profile variations, which even remove some objects from the class temporarily. Some of them are spectroscopic binaries; it is possible that the peculiar profiles may have multiple causes among different objects. The origin and future of these stars are intriguing; for instance, they could be stellar mergers and/or gamma-ray-burst progenitors.
Fil: Walborn, Nolan R.. Space Telescope Science Institute; Estados Unidos
Fil: Howarth, Ian D.. University College London; Estados Unidos
Fil: Evans, Christopher J.. Royal Observatory Edinburgh. Astronomy Technology Centre; Reino Unido
Fil: Crowther, Paul A.. University of Sheffield. Department of Physics and Astronomy; Reino Unido
Fil: Moffat, Anthony F. J.. University Of Montreal; Canadá
Fil: St Louis, Nicole. University Of Montreal; Canadá
Fil: Fariña, Cecilia. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina
Fil: Bosch, Guillermo Luis. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina
Fil: Morrell, Nidia Irene. Observatorio Las Campanas; Chile
Fil: Barba, Rodolfo Hector. Universidad de la Serena. Facultad de Ciencias; Chile. Consejo Nacional de Investigaciones Cienti­ficas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; Argentina
Fil: van Loon, Jacco Th.. Keele University. School of Physical & Geographical Sciences; Reino Unido
description The Onfp class of rotationally broadened, hot spectra was defined some time ago in the Galaxy, where its membership to date numbers only eight. The principal defining characteristic is a broad, centrally reversed He ii λ 4686 emission profile; other emission and absorption lines are also rotationally broadened. Recent surveys in the Magellanic Clouds (MCs) have brought the class membership there, including some related spectra, to 28. We present a survey of the spectral morphology and rotational velocities, as a first step toward elucidating the nature of this class. Evolved, rapidly rotating hot stars are not expected theoretically, because the stellar winds should brake the rotation. Luminosity classification of these spectra is not possible, because the principal criterion (He ii λ4686) is peculiar; however, the MCs provide reliable absolute magnitudes, which show that they span the entire range from dwarfs to supergiants. The Onfp line-broadening distribution is distinct and shifted toward larger values from those of normal O dwarfs and supergiants with >99.99% confidence. All cases with multiple observations show line-profile variations, which even remove some objects from the class temporarily. Some of them are spectroscopic binaries; it is possible that the peculiar profiles may have multiple causes among different objects. The origin and future of these stars are intriguing; for instance, they could be stellar mergers and/or gamma-ray-burst progenitors.
publishDate 2010
dc.date.none.fl_str_mv 2010-03
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/11336/9568
Walborn, Nolan R.; Howarth, Ian D.; Evans, Christopher J.; Crowther, Paul A.; Moffat, Anthony F. J.; et al.; The Onfp class in the Magellanic Clouds; Iop Publishing; Astronomical Journal; 139; 3-2010; 1283-1294
0004-6256
url http://hdl.handle.net/11336/9568
identifier_str_mv Walborn, Nolan R.; Howarth, Ian D.; Evans, Christopher J.; Crowther, Paul A.; Moffat, Anthony F. J.; et al.; The Onfp class in the Magellanic Clouds; Iop Publishing; Astronomical Journal; 139; 3-2010; 1283-1294
0004-6256
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://adsabs.harvard.edu/abs/2010AJ....139.1283W
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1001.4032
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0004-6256/139/3/1283/meta
info:eu-repo/semantics/altIdentifier/doi/10.1088/0004-6256/139/3/1283
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
application/pdf
dc.publisher.none.fl_str_mv Iop Publishing
publisher.none.fl_str_mv Iop Publishing
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 13.070432

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