Wind structure and luminosity variations in the Wolf-Rayet/Luminous Blue Variable HD 5980

Autores
Georgiev, Leonid; Koenigsberger, Gloria; Hillier, D. John; Morrell, Nidia; Barba, Rodolfo Hector; Gamen, Roberto Claudio
Año de publicación
2011
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Over the past 40 years, the massive luminous blue variable/Wolf-Rayet system HD 5980 in the Small Magellanic Cloud (SMC) has undergone a long-term S Doradus-type variability cycle and two brief and violent eruptions in 1993 and 1994. In this paper we analyze a collection of UV and optical spectra obtained between 1979 and 2009 and perform CMFGEN model fits to spectra of 1994, 2000, 2002, and 2009. The results are as follows: (1) the long-term S Dor-type variability is associated with changes of the hydrostatic radius; (2) the 1994 eruption involved changes in its bolometric luminosity and wind structure; (3) the emission-line strength, the wind velocity, and the continuum luminosity underwent correlated variations in the sense that a decreasing V ∞ is associated with increasing emission line and continuum levels; and (4) the spectrum of the third star in the system (Star C) is well fit by a T eff = 32 K model atmosphere with SMC chemical abundances. For all epochs, the wind of the erupting star is optically thick at the sonic point and is thus driven mainly by the continuum opacity. We speculate that the wind switches between two stable regimes driven by the "hot" (during the eruption) and the "cool" (post-eruption) iron opacity bumps as defined by Lamers & Nugis and Gräfener & Hamann, and thus the wind may undergo a bi-stability jump of a different nature from that which occurs in OB stars.
Fil: Georgiev, Leonid. Universidad Autónoma de México; México
Fil: Koenigsberger, Gloria. Universidad Autónoma de México; México
Fil: Hillier, D. John. University Of Pittsburgh; Estados Unidos
Fil: Morrell, Nidia. The Carnegie Observatories. Las Campanas Observatory; Chile
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. 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. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Materia
Binaries
Variable Stars
Wolf-Rayet Stars
Eclipsing 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:11336/9695
Acceder
id CONICETDig_eb9efe30d1743bd46cc3c6fd551bcc8f
oai_identifier_str oai:ri.conicet.gov.ar:11336/9695
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Wind structure and luminosity variations in the Wolf-Rayet/Luminous Blue Variable HD 5980Georgiev, LeonidKoenigsberger, GloriaHillier, D. JohnMorrell, NidiaBarba, Rodolfo HectorGamen, Roberto ClaudioBinariesVariable StarsWolf-Rayet StarsEclipsing Starshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Over the past 40 years, the massive luminous blue variable/Wolf-Rayet system HD 5980 in the Small Magellanic Cloud (SMC) has undergone a long-term S Doradus-type variability cycle and two brief and violent eruptions in 1993 and 1994. In this paper we analyze a collection of UV and optical spectra obtained between 1979 and 2009 and perform CMFGEN model fits to spectra of 1994, 2000, 2002, and 2009. The results are as follows: (1) the long-term S Dor-type variability is associated with changes of the hydrostatic radius; (2) the 1994 eruption involved changes in its bolometric luminosity and wind structure; (3) the emission-line strength, the wind velocity, and the continuum luminosity underwent correlated variations in the sense that a decreasing V ∞ is associated with increasing emission line and continuum levels; and (4) the spectrum of the third star in the system (Star C) is well fit by a T eff = 32 K model atmosphere with SMC chemical abundances. For all epochs, the wind of the erupting star is optically thick at the sonic point and is thus driven mainly by the continuum opacity. We speculate that the wind switches between two stable regimes driven by the "hot" (during the eruption) and the "cool" (post-eruption) iron opacity bumps as defined by Lamers & Nugis and Gräfener & Hamann, and thus the wind may undergo a bi-stability jump of a different nature from that which occurs in OB stars.Fil: Georgiev, Leonid. Universidad Autónoma de México; MéxicoFil: Koenigsberger, Gloria. Universidad Autónoma de México; MéxicoFil: Hillier, D. John. University Of Pittsburgh; Estados UnidosFil: Morrell, Nidia. The Carnegie Observatories. Las Campanas Observatory; ChileFil: 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. 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; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaIop Publishing2011-12info: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/11336/9695Georgiev, Leonid; Koenigsberger, Gloria; Hillier, D. John; Morrell, Nidia; Barba, Rodolfo Hector; et al.; Wind structure and luminosity variations in the Wolf-Rayet/Luminous Blue Variable HD 5980; Iop Publishing; Astronomical Journal; 142; 6; 12-2011; 191-2100004-6256enginfo:eu-repo/semantics/altIdentifier/doi/10.1088/0004-6256/142/6/191info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0004-6256/142/6/191/metainfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:45:24Zoai:ri.conicet.gov.ar:11336/9695instacron: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:34982025-09-03 09:45:24.68CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Wind structure and luminosity variations in the Wolf-Rayet/Luminous Blue Variable HD 5980
title Wind structure and luminosity variations in the Wolf-Rayet/Luminous Blue Variable HD 5980
spellingShingle Wind structure and luminosity variations in the Wolf-Rayet/Luminous Blue Variable HD 5980
Georgiev, Leonid
Binaries
Variable Stars
Wolf-Rayet Stars
Eclipsing Stars
title_short Wind structure and luminosity variations in the Wolf-Rayet/Luminous Blue Variable HD 5980
title_full Wind structure and luminosity variations in the Wolf-Rayet/Luminous Blue Variable HD 5980
title_fullStr Wind structure and luminosity variations in the Wolf-Rayet/Luminous Blue Variable HD 5980
title_full_unstemmed Wind structure and luminosity variations in the Wolf-Rayet/Luminous Blue Variable HD 5980
title_sort Wind structure and luminosity variations in the Wolf-Rayet/Luminous Blue Variable HD 5980
dc.creator.none.fl_str_mv Georgiev, Leonid
Koenigsberger, Gloria
Hillier, D. John
Morrell, Nidia
Barba, Rodolfo Hector
Gamen, Roberto Claudio
author Georgiev, Leonid
author_facet Georgiev, Leonid
Koenigsberger, Gloria
Hillier, D. John
Morrell, Nidia
Barba, Rodolfo Hector
Gamen, Roberto Claudio
author_role author
author2 Koenigsberger, Gloria
Hillier, D. John
Morrell, Nidia
Barba, Rodolfo Hector
Gamen, Roberto Claudio
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Binaries
Variable Stars
Wolf-Rayet Stars
Eclipsing Stars
topic Binaries
Variable Stars
Wolf-Rayet Stars
Eclipsing 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 Over the past 40 years, the massive luminous blue variable/Wolf-Rayet system HD 5980 in the Small Magellanic Cloud (SMC) has undergone a long-term S Doradus-type variability cycle and two brief and violent eruptions in 1993 and 1994. In this paper we analyze a collection of UV and optical spectra obtained between 1979 and 2009 and perform CMFGEN model fits to spectra of 1994, 2000, 2002, and 2009. The results are as follows: (1) the long-term S Dor-type variability is associated with changes of the hydrostatic radius; (2) the 1994 eruption involved changes in its bolometric luminosity and wind structure; (3) the emission-line strength, the wind velocity, and the continuum luminosity underwent correlated variations in the sense that a decreasing V ∞ is associated with increasing emission line and continuum levels; and (4) the spectrum of the third star in the system (Star C) is well fit by a T eff = 32 K model atmosphere with SMC chemical abundances. For all epochs, the wind of the erupting star is optically thick at the sonic point and is thus driven mainly by the continuum opacity. We speculate that the wind switches between two stable regimes driven by the "hot" (during the eruption) and the "cool" (post-eruption) iron opacity bumps as defined by Lamers & Nugis and Gräfener & Hamann, and thus the wind may undergo a bi-stability jump of a different nature from that which occurs in OB stars.
Fil: Georgiev, Leonid. Universidad Autónoma de México; México
Fil: Koenigsberger, Gloria. Universidad Autónoma de México; México
Fil: Hillier, D. John. University Of Pittsburgh; Estados Unidos
Fil: Morrell, Nidia. The Carnegie Observatories. Las Campanas Observatory; Chile
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. 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. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
description Over the past 40 years, the massive luminous blue variable/Wolf-Rayet system HD 5980 in the Small Magellanic Cloud (SMC) has undergone a long-term S Doradus-type variability cycle and two brief and violent eruptions in 1993 and 1994. In this paper we analyze a collection of UV and optical spectra obtained between 1979 and 2009 and perform CMFGEN model fits to spectra of 1994, 2000, 2002, and 2009. The results are as follows: (1) the long-term S Dor-type variability is associated with changes of the hydrostatic radius; (2) the 1994 eruption involved changes in its bolometric luminosity and wind structure; (3) the emission-line strength, the wind velocity, and the continuum luminosity underwent correlated variations in the sense that a decreasing V ∞ is associated with increasing emission line and continuum levels; and (4) the spectrum of the third star in the system (Star C) is well fit by a T eff = 32 K model atmosphere with SMC chemical abundances. For all epochs, the wind of the erupting star is optically thick at the sonic point and is thus driven mainly by the continuum opacity. We speculate that the wind switches between two stable regimes driven by the "hot" (during the eruption) and the "cool" (post-eruption) iron opacity bumps as defined by Lamers & Nugis and Gräfener & Hamann, and thus the wind may undergo a bi-stability jump of a different nature from that which occurs in OB stars.
publishDate 2011
dc.date.none.fl_str_mv 2011-12
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/11336/9695
Georgiev, Leonid; Koenigsberger, Gloria; Hillier, D. John; Morrell, Nidia; Barba, Rodolfo Hector; et al.; Wind structure and luminosity variations in the Wolf-Rayet/Luminous Blue Variable HD 5980; Iop Publishing; Astronomical Journal; 142; 6; 12-2011; 191-210
0004-6256
url http://hdl.handle.net/11336/9695
identifier_str_mv Georgiev, Leonid; Koenigsberger, Gloria; Hillier, D. John; Morrell, Nidia; Barba, Rodolfo Hector; et al.; Wind structure and luminosity variations in the Wolf-Rayet/Luminous Blue Variable HD 5980; Iop Publishing; Astronomical Journal; 142; 6; 12-2011; 191-210
0004-6256
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1088/0004-6256/142/6/191
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0004-6256/142/6/191/meta
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_ 1842268729055903744
score 13.13397

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