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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/35935
Ver los metadatos del registro completo
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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 Técnicas2025-09-29T10:17:26Zoai: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:34982025-09-29 10:17:26.942CONICET 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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1844614127289368576 |
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13.070432 |