A ~ 40 year variability cycle in the luminous blue variable/Wolf-Rayet Binary System HD 5980?

Autores
Koenigsberger, Gloria; Georgiev, Leonid; Hillier, D. John; Morrell, Nidia Irene; Barba, Rodolfo Hector; Gamen, Roberto Claudio
Año de publicación
2010
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The massive Wolf-Rayet stellar system HD 5980 in the Small Magellanic Cloud entered a sudden and brief ~ 1-3 mag eruptive state in the mid-1990s. The cause of the instability is not yet understood, but mechanisms similar to those in luminous blue variables are suspected. Using a previously unreported set of spectroscopic data obtained in 1955-1967 and recently acquired optical and HST/STIS spectra, we find that (1) the brief eruptions of 1993 and 1994 occurred at the beginning of an extended (~ decades) high state of activity characterized by large emission-line intensities; (2) the level of activity is currently subsiding; and (3) another strong emission-line episode appears to have occurred between 1960 and 1965, suggesting the possibility that the long-term cyclical variability may be recurrent on a ~ 40 year timescale. These characteristics suggest the possible classification of HD 5980 as an S Doradus-type variable. The effects due to binary interactions in the system are discussed, and we tentatively suggest that the short duration and relatively hot spectral type (WN11/B1.5I) observed during maximum in the visual light curve may be attributed to these interactions.
Fil: Koenigsberger, Gloria. Universidad Nacional Autónoma de México; México
Fil: Georgiev, Leonid. Universidad Nacional Autónoma de México; México
Fil: Hillier, D. John. University Of Pittsburgh; Estados Unidos
Fil: Morrell, Nidia Irene. The Carnegie Observatories. Las Campanas Observatory; Chile. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Barba, Rodolfo Hector. Consejo Nacional de Investigaciones Cientiâ­ficas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; Argentina. Universidad de la Serena; Chile
Fil: Gamen, Roberto Claudio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; Argentina
Materia
Eclipsing Binaries:
Hd 5980 (Estrella)
S Doradus (Estrella)
Wolf-Rayet Stars
Variable Stars
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:11336/9583
Acceder
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repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling A ~ 40 year variability cycle in the luminous blue variable/Wolf-Rayet Binary System HD 5980?Koenigsberger, GloriaGeorgiev, LeonidHillier, D. JohnMorrell, Nidia IreneBarba, Rodolfo HectorGamen, Roberto ClaudioEclipsing Binaries:Hd 5980 (Estrella)S Doradus (Estrella)Wolf-Rayet StarsVariable Starshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1The massive Wolf-Rayet stellar system HD 5980 in the Small Magellanic Cloud entered a sudden and brief ~ 1-3 mag eruptive state in the mid-1990s. The cause of the instability is not yet understood, but mechanisms similar to those in luminous blue variables are suspected. Using a previously unreported set of spectroscopic data obtained in 1955-1967 and recently acquired optical and HST/STIS spectra, we find that (1) the brief eruptions of 1993 and 1994 occurred at the beginning of an extended (~ decades) high state of activity characterized by large emission-line intensities; (2) the level of activity is currently subsiding; and (3) another strong emission-line episode appears to have occurred between 1960 and 1965, suggesting the possibility that the long-term cyclical variability may be recurrent on a ~ 40 year timescale. These characteristics suggest the possible classification of HD 5980 as an S Doradus-type variable. The effects due to binary interactions in the system are discussed, and we tentatively suggest that the short duration and relatively hot spectral type (WN11/B1.5I) observed during maximum in the visual light curve may be attributed to these interactions.Fil: Koenigsberger, Gloria. Universidad Nacional Autónoma de México; MéxicoFil: Georgiev, Leonid. Universidad Nacional Autónoma de México; MéxicoFil: Hillier, D. John. University Of Pittsburgh; Estados UnidosFil: Morrell, Nidia Irene. The Carnegie Observatories. Las Campanas Observatory; Chile. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Barba, Rodolfo Hector. Consejo Nacional de Investigaciones Cientiâ­ficas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; Argentina. Universidad de la Serena; ChileFil: Gamen, Roberto Claudio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; ArgentinaIop Publishing2010-06info: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/11336/9583Koenigsberger, Gloria; Georgiev, Leonid; Hillier, D. John; Morrell, Nidia Irene; Barba, Rodolfo Hector; et al.; A ~ 40 year variability cycle in the luminous blue variable/Wolf-Rayet Binary System HD 5980?; Iop Publishing; Astronomical Journal; 139; 6; 6-2010; 2600-26110004-6256enginfo:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0004-6256/139/6/2600/metainfo:eu-repo/semantics/altIdentifier/doi/10.1088/0004-6256/139/6/2600info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-11-12T09:48:20Zoai:ri.conicet.gov.ar:11336/9583instacron: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 09:48:21.01CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv A ~ 40 year variability cycle in the luminous blue variable/Wolf-Rayet Binary System HD 5980?
title A ~ 40 year variability cycle in the luminous blue variable/Wolf-Rayet Binary System HD 5980?
spellingShingle A ~ 40 year variability cycle in the luminous blue variable/Wolf-Rayet Binary System HD 5980?
Koenigsberger, Gloria
Eclipsing Binaries:
Hd 5980 (Estrella)
S Doradus (Estrella)
Wolf-Rayet Stars
Variable Stars
title_short A ~ 40 year variability cycle in the luminous blue variable/Wolf-Rayet Binary System HD 5980?
title_full A ~ 40 year variability cycle in the luminous blue variable/Wolf-Rayet Binary System HD 5980?
title_fullStr A ~ 40 year variability cycle in the luminous blue variable/Wolf-Rayet Binary System HD 5980?
title_full_unstemmed A ~ 40 year variability cycle in the luminous blue variable/Wolf-Rayet Binary System HD 5980?
title_sort A ~ 40 year variability cycle in the luminous blue variable/Wolf-Rayet Binary System HD 5980?
dc.creator.none.fl_str_mv Koenigsberger, Gloria
Georgiev, Leonid
Hillier, D. John
Morrell, Nidia Irene
Barba, Rodolfo Hector
Gamen, Roberto Claudio
author Koenigsberger, Gloria
author_facet Koenigsberger, Gloria
Georgiev, Leonid
Hillier, D. John
Morrell, Nidia Irene
Barba, Rodolfo Hector
Gamen, Roberto Claudio
author_role author
author2 Georgiev, Leonid
Hillier, D. John
Morrell, Nidia Irene
Barba, Rodolfo Hector
Gamen, Roberto Claudio
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Eclipsing Binaries:
Hd 5980 (Estrella)
S Doradus (Estrella)
Wolf-Rayet Stars
Variable Stars
topic Eclipsing Binaries:
Hd 5980 (Estrella)
S Doradus (Estrella)
Wolf-Rayet Stars
Variable Stars
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The massive Wolf-Rayet stellar system HD 5980 in the Small Magellanic Cloud entered a sudden and brief ~ 1-3 mag eruptive state in the mid-1990s. The cause of the instability is not yet understood, but mechanisms similar to those in luminous blue variables are suspected. Using a previously unreported set of spectroscopic data obtained in 1955-1967 and recently acquired optical and HST/STIS spectra, we find that (1) the brief eruptions of 1993 and 1994 occurred at the beginning of an extended (~ decades) high state of activity characterized by large emission-line intensities; (2) the level of activity is currently subsiding; and (3) another strong emission-line episode appears to have occurred between 1960 and 1965, suggesting the possibility that the long-term cyclical variability may be recurrent on a ~ 40 year timescale. These characteristics suggest the possible classification of HD 5980 as an S Doradus-type variable. The effects due to binary interactions in the system are discussed, and we tentatively suggest that the short duration and relatively hot spectral type (WN11/B1.5I) observed during maximum in the visual light curve may be attributed to these interactions.
Fil: Koenigsberger, Gloria. Universidad Nacional Autónoma de México; México
Fil: Georgiev, Leonid. Universidad Nacional Autónoma de México; México
Fil: Hillier, D. John. University Of Pittsburgh; Estados Unidos
Fil: Morrell, Nidia Irene. The Carnegie Observatories. Las Campanas Observatory; Chile. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Barba, Rodolfo Hector. Consejo Nacional de Investigaciones Cientiâ­ficas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; Argentina. Universidad de la Serena; Chile
Fil: Gamen, Roberto Claudio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; Argentina
description The massive Wolf-Rayet stellar system HD 5980 in the Small Magellanic Cloud entered a sudden and brief ~ 1-3 mag eruptive state in the mid-1990s. The cause of the instability is not yet understood, but mechanisms similar to those in luminous blue variables are suspected. Using a previously unreported set of spectroscopic data obtained in 1955-1967 and recently acquired optical and HST/STIS spectra, we find that (1) the brief eruptions of 1993 and 1994 occurred at the beginning of an extended (~ decades) high state of activity characterized by large emission-line intensities; (2) the level of activity is currently subsiding; and (3) another strong emission-line episode appears to have occurred between 1960 and 1965, suggesting the possibility that the long-term cyclical variability may be recurrent on a ~ 40 year timescale. These characteristics suggest the possible classification of HD 5980 as an S Doradus-type variable. The effects due to binary interactions in the system are discussed, and we tentatively suggest that the short duration and relatively hot spectral type (WN11/B1.5I) observed during maximum in the visual light curve may be attributed to these interactions.
publishDate 2010
dc.date.none.fl_str_mv 2010-06
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/11336/9583
Koenigsberger, Gloria; Georgiev, Leonid; Hillier, D. John; Morrell, Nidia Irene; Barba, Rodolfo Hector; et al.; A ~ 40 year variability cycle in the luminous blue variable/Wolf-Rayet Binary System HD 5980?; Iop Publishing; Astronomical Journal; 139; 6; 6-2010; 2600-2611
0004-6256
url http://hdl.handle.net/11336/9583
identifier_str_mv Koenigsberger, Gloria; Georgiev, Leonid; Hillier, D. John; Morrell, Nidia Irene; Barba, Rodolfo Hector; et al.; A ~ 40 year variability cycle in the luminous blue variable/Wolf-Rayet Binary System HD 5980?; Iop Publishing; Astronomical Journal; 139; 6; 6-2010; 2600-2611
0004-6256
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0004-6256/139/6/2600/meta
info:eu-repo/semantics/altIdentifier/doi/10.1088/0004-6256/139/6/2600
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
_version_ 1848598003182469120
score 13.24909

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