The interplay between pulsations and mass loss in the blue supergiant 55 Cygnus = HD 198478

Autores
Kraus, M.; Haucke, M.; Cidale, Lydia Sonia; Venero, Roberto Oscar José; Nickeler, D.; Németh, P.; Niemczura, E.; Tomic, S.; Aret, A.; Kubat, J.; Kubátová, B.; Oksala, Mary E.; Cure, M.; Kaminski, K.; Dimitrov, W.; Fagas, M.; Polinska, M.
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Blue supergiant stars are known to display photometric and spectroscopic variability that is suggested to be linked to stellar pulsations. Pulsational activity in massive stars strongly depends on the star´s evolutionary stage and is assumed to be connected with mass-loss episodes, the appearance of macroturbulent line broadening, and the formation of clumps in the wind. To investigate a possible interplay between pulsations and mass-loss, we carried out an observational campaign of the supergiant 55 Cyg over a period of five years to search for photospheric activity and cyclic mass-loss variability in the stellar wind. We modeled the H, He I, Si II and Si III lines using the nonlocal thermal equilibrium atmosphere code FASTWIND and derived the photospheric and wind parameters. In addition, we searched for variability in the intensity and radial velocity of photospheric lines and performed a moment analysis of the line profiles to derive frequencies and amplitudes of the variations. The Halpha line varies with time in both intensity and shape, displaying various types of profiles: P Cygni, pure emission, almost complete absence, and double or multiple peaked. The star undergoes episodes of variable mass-loss rates that change by a factor of 1.7-2 on different timescales. We also observe changes in the ionization rate of Si II and determine a multiperiodic oscillation in the He I absorption lines, with periods ranging from a few hours to 22.5 days. We interpret the photospheric line variations in terms of oscillations in p-, g-, and strange modes. We suggest that these pulsations can lead to phases of enhanced mass loss. Furthermore, they can mislead the determination of the stellar rotation. We classify the star as a post-red supergiant, belonging to the group of alpha Cyg variables.
Fil: Kraus, M.. Astronomický Ústav, Rep. Checa;
Fil: Haucke, M.. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Cidale, Lydia Sonia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica la Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Venero, Roberto Oscar José. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica la Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Nickeler, D.. Astronomický Ústav, Rep. Checa;
Fil: Németh, P.. Universität Erlangen Nürnberg; Alemania
Fil: Niemczura, E.. Wrocław University. Astronomical Institute; Polonia
Fil: Tomic, S.. Univerzita Karlova, Rep. Checa;
Fil: Aret, A.. Tartu Observatory, Toravere, Estonia;
Fil: Kubat, J.. Astronomický Ústav, Rep. Checa;
Fil: Kubátová, B.. Astronomický Ústav, Rep. Checa;
Fil: Oksala, Mary E.. Lesia, Observatoire de Paris, Francia;
Fil: Cure, M.. Universidad de Valparaiso, Chile;
Fil: Kaminski, K.. Mickiewicz University. Astronomical Observatory Institute; Polonia
Fil: Dimitrov, W.. Mickiewicz University. Astronomical Observatory Institute; Polonia
Fil: Fagas, M.. Mickiewicz University. Astronomical Observatory Institute; Polonia
Fil: Polinska, M.. Mickiewicz University. Astronomical Observatory Institute; Polonia
Materia
Early type stars
Supergiant stars
Winds
Mass loss
Outflows
55 Cyg (estrella)
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:11336/35935
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/35935
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling The interplay between pulsations and mass loss in the blue supergiant 55 Cygnus = HD 198478Kraus, M.Haucke, M.Cidale, Lydia SoniaVenero, Roberto Oscar JoséNickeler, D.Németh, P.Niemczura, E.Tomic, S.Aret, A.Kubat, J.Kubátová, B.Oksala, Mary E.Cure, M.Kaminski, K.Dimitrov, W.Fagas, M.Polinska, M.Early type starsSupergiant starsWindsMass lossOutflows55 Cyg (estrella)https://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Blue supergiant stars are known to display photometric and spectroscopic variability that is suggested to be linked to stellar pulsations. Pulsational activity in massive stars strongly depends on the star´s evolutionary stage and is assumed to be connected with mass-loss episodes, the appearance of macroturbulent line broadening, and the formation of clumps in the wind. To investigate a possible interplay between pulsations and mass-loss, we carried out an observational campaign of the supergiant 55 Cyg over a period of five years to search for photospheric activity and cyclic mass-loss variability in the stellar wind. We modeled the H, He I, Si II and Si III lines using the nonlocal thermal equilibrium atmosphere code FASTWIND and derived the photospheric and wind parameters. In addition, we searched for variability in the intensity and radial velocity of photospheric lines and performed a moment analysis of the line profiles to derive frequencies and amplitudes of the variations. The Halpha line varies with time in both intensity and shape, displaying various types of profiles: P Cygni, pure emission, almost complete absence, and double or multiple peaked. The star undergoes episodes of variable mass-loss rates that change by a factor of 1.7-2 on different timescales. We also observe changes in the ionization rate of Si II and determine a multiperiodic oscillation in the He I absorption lines, with periods ranging from a few hours to 22.5 days. We interpret the photospheric line variations in terms of oscillations in p-, g-, and strange modes. We suggest that these pulsations can lead to phases of enhanced mass loss. Furthermore, they can mislead the determination of the stellar rotation. We classify the star as a post-red supergiant, belonging to the group of alpha Cyg variables.Fil: Kraus, M.. Astronomický Ústav, Rep. Checa;Fil: Haucke, M.. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaFil: Cidale, Lydia Sonia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica la Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaFil: Venero, Roberto Oscar José. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica la Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaFil: Nickeler, D.. Astronomický Ústav, Rep. Checa;Fil: Németh, P.. Universität Erlangen Nürnberg; AlemaniaFil: Niemczura, E.. Wrocław University. Astronomical Institute; PoloniaFil: Tomic, S.. Univerzita Karlova, Rep. Checa;Fil: Aret, A.. Tartu Observatory, Toravere, Estonia;Fil: Kubat, J.. Astronomický Ústav, Rep. Checa;Fil: Kubátová, B.. Astronomický Ústav, Rep. Checa;Fil: Oksala, Mary E.. Lesia, Observatoire de Paris, Francia;Fil: Cure, M.. Universidad de Valparaiso, Chile;Fil: Kaminski, K.. Mickiewicz University. Astronomical Observatory Institute; PoloniaFil: Dimitrov, W.. Mickiewicz University. Astronomical Observatory Institute; PoloniaFil: Fagas, M.. Mickiewicz University. Astronomical Observatory Institute; PoloniaFil: Polinska, M.. Mickiewicz University. Astronomical Observatory Institute; PoloniaEDP Sciences2015-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/35935Kraus, M.; Haucke, M.; Cidale, Lydia Sonia; Venero, Roberto Oscar José; Nickeler, D.; et al.; The interplay between pulsations and mass loss in the blue supergiant 55 Cygnus = HD 198478; EDP Sciences; Astronomy and Astrophysics; 581; 9-2015; 1-220004-6361CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/articles/aa/pdf/2015/09/aa25383-14.pdfinfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201425383info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:47:40Zoai:ri.conicet.gov.ar:11336/35935instacron: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 11:47:40.77CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The interplay between pulsations and mass loss in the blue supergiant 55 Cygnus = HD 198478
title The interplay between pulsations and mass loss in the blue supergiant 55 Cygnus = HD 198478
spellingShingle The interplay between pulsations and mass loss in the blue supergiant 55 Cygnus = HD 198478
Kraus, M.
Early type stars
Supergiant stars
Winds
Mass loss
Outflows
55 Cyg (estrella)
title_short The interplay between pulsations and mass loss in the blue supergiant 55 Cygnus = HD 198478
title_full The interplay between pulsations and mass loss in the blue supergiant 55 Cygnus = HD 198478
title_fullStr The interplay between pulsations and mass loss in the blue supergiant 55 Cygnus = HD 198478
title_full_unstemmed The interplay between pulsations and mass loss in the blue supergiant 55 Cygnus = HD 198478
title_sort The interplay between pulsations and mass loss in the blue supergiant 55 Cygnus = HD 198478
dc.creator.none.fl_str_mv Kraus, M.
Haucke, M.
Cidale, Lydia Sonia
Venero, Roberto Oscar José
Nickeler, D.
Németh, P.
Niemczura, E.
Tomic, S.
Aret, A.
Kubat, J.
Kubátová, B.
Oksala, Mary E.
Cure, M.
Kaminski, K.
Dimitrov, W.
Fagas, M.
Polinska, M.
author Kraus, M.
author_facet Kraus, M.
Haucke, M.
Cidale, Lydia Sonia
Venero, Roberto Oscar José
Nickeler, D.
Németh, P.
Niemczura, E.
Tomic, S.
Aret, A.
Kubat, J.
Kubátová, B.
Oksala, Mary E.
Cure, M.
Kaminski, K.
Dimitrov, W.
Fagas, M.
Polinska, M.
author_role author
author2 Haucke, M.
Cidale, Lydia Sonia
Venero, Roberto Oscar José
Nickeler, D.
Németh, P.
Niemczura, E.
Tomic, S.
Aret, A.
Kubat, J.
Kubátová, B.
Oksala, Mary E.
Cure, M.
Kaminski, K.
Dimitrov, W.
Fagas, M.
Polinska, M.
author2_role author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Early type stars
Supergiant stars
Winds
Mass loss
Outflows
55 Cyg (estrella)
topic Early type stars
Supergiant stars
Winds
Mass loss
Outflows
55 Cyg (estrella)
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Blue supergiant stars are known to display photometric and spectroscopic variability that is suggested to be linked to stellar pulsations. Pulsational activity in massive stars strongly depends on the star´s evolutionary stage and is assumed to be connected with mass-loss episodes, the appearance of macroturbulent line broadening, and the formation of clumps in the wind. To investigate a possible interplay between pulsations and mass-loss, we carried out an observational campaign of the supergiant 55 Cyg over a period of five years to search for photospheric activity and cyclic mass-loss variability in the stellar wind. We modeled the H, He I, Si II and Si III lines using the nonlocal thermal equilibrium atmosphere code FASTWIND and derived the photospheric and wind parameters. In addition, we searched for variability in the intensity and radial velocity of photospheric lines and performed a moment analysis of the line profiles to derive frequencies and amplitudes of the variations. The Halpha line varies with time in both intensity and shape, displaying various types of profiles: P Cygni, pure emission, almost complete absence, and double or multiple peaked. The star undergoes episodes of variable mass-loss rates that change by a factor of 1.7-2 on different timescales. We also observe changes in the ionization rate of Si II and determine a multiperiodic oscillation in the He I absorption lines, with periods ranging from a few hours to 22.5 days. We interpret the photospheric line variations in terms of oscillations in p-, g-, and strange modes. We suggest that these pulsations can lead to phases of enhanced mass loss. Furthermore, they can mislead the determination of the stellar rotation. We classify the star as a post-red supergiant, belonging to the group of alpha Cyg variables.
Fil: Kraus, M.. Astronomický Ústav, Rep. Checa;
Fil: Haucke, M.. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Cidale, Lydia Sonia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica la Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Venero, Roberto Oscar José. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica la Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Nickeler, D.. Astronomický Ústav, Rep. Checa;
Fil: Németh, P.. Universität Erlangen Nürnberg; Alemania
Fil: Niemczura, E.. Wrocław University. Astronomical Institute; Polonia
Fil: Tomic, S.. Univerzita Karlova, Rep. Checa;
Fil: Aret, A.. Tartu Observatory, Toravere, Estonia;
Fil: Kubat, J.. Astronomický Ústav, Rep. Checa;
Fil: Kubátová, B.. Astronomický Ústav, Rep. Checa;
Fil: Oksala, Mary E.. Lesia, Observatoire de Paris, Francia;
Fil: Cure, M.. Universidad de Valparaiso, Chile;
Fil: Kaminski, K.. Mickiewicz University. Astronomical Observatory Institute; Polonia
Fil: Dimitrov, W.. Mickiewicz University. Astronomical Observatory Institute; Polonia
Fil: Fagas, M.. Mickiewicz University. Astronomical Observatory Institute; Polonia
Fil: Polinska, M.. Mickiewicz University. Astronomical Observatory Institute; Polonia
description Blue supergiant stars are known to display photometric and spectroscopic variability that is suggested to be linked to stellar pulsations. Pulsational activity in massive stars strongly depends on the star´s evolutionary stage and is assumed to be connected with mass-loss episodes, the appearance of macroturbulent line broadening, and the formation of clumps in the wind. To investigate a possible interplay between pulsations and mass-loss, we carried out an observational campaign of the supergiant 55 Cyg over a period of five years to search for photospheric activity and cyclic mass-loss variability in the stellar wind. We modeled the H, He I, Si II and Si III lines using the nonlocal thermal equilibrium atmosphere code FASTWIND and derived the photospheric and wind parameters. In addition, we searched for variability in the intensity and radial velocity of photospheric lines and performed a moment analysis of the line profiles to derive frequencies and amplitudes of the variations. The Halpha line varies with time in both intensity and shape, displaying various types of profiles: P Cygni, pure emission, almost complete absence, and double or multiple peaked. The star undergoes episodes of variable mass-loss rates that change by a factor of 1.7-2 on different timescales. We also observe changes in the ionization rate of Si II and determine a multiperiodic oscillation in the He I absorption lines, with periods ranging from a few hours to 22.5 days. We interpret the photospheric line variations in terms of oscillations in p-, g-, and strange modes. We suggest that these pulsations can lead to phases of enhanced mass loss. Furthermore, they can mislead the determination of the stellar rotation. We classify the star as a post-red supergiant, belonging to the group of alpha Cyg variables.
publishDate 2015
dc.date.none.fl_str_mv 2015-09
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/11336/35935
Kraus, M.; Haucke, M.; Cidale, Lydia Sonia; Venero, Roberto Oscar José; Nickeler, D.; et al.; The interplay between pulsations and mass loss in the blue supergiant 55 Cygnus = HD 198478; EDP Sciences; Astronomy and Astrophysics; 581; 9-2015; 1-22
0004-6361
CONICET Digital
CONICET
url http://hdl.handle.net/11336/35935
identifier_str_mv Kraus, M.; Haucke, M.; Cidale, Lydia Sonia; Venero, Roberto Oscar José; Nickeler, D.; et al.; The interplay between pulsations and mass loss in the blue supergiant 55 Cygnus = HD 198478; EDP Sciences; Astronomy and Astrophysics; 581; 9-2015; 1-22
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/url/http://www.aanda.org/articles/aa/pdf/2015/09/aa25383-14.pdf
info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201425383
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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