A new massive double-lined spectroscopic binary system: The Wolf-Rayet star WR 68a

Autores
Collado, A.; Gamen, Roberto Claudio; Barbá, Rodolfo Héctor; Morrell, Nidia Irene
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Double-lined spectroscopic binary systems, containing a Wolf-Rayet and a massive O-type star, are key objects for the study of massive star evolution because these kinds of systems allow the determination of fundamental astrophysical parameters of their components. We have performed spectroscopic observations of the star WR 68a as part of a dedicated monitoring program of WR stars to discover new binary systems. We identified spectral lines of the two components of the system and disentangled the spectra. We measured the radial velocities in the separated spectra and determined the orbital solution. We discovered that WR 68a is a double-lined spectroscopic binary with an orbital period of 5.2207 days, very small or null eccentricity, and inclination ranging between 75 and 85 deg. We classified the binary components as WN6 and O5.5-6. The WN star is less massive than the O-type star with minimum masses of 15 ± 5 M⊙ and 30 ± 4 M⊙, respectively. The equivalent width of the He II λ4686 emission line shows variations with the orbital phase, presenting a minimum when the WN star is in front of the system. The light curve constructed from available photometric data presents minima in both conjunctions of the system.
Facultad de Ciencias Astronómicas y Geofísicas
Instituto de Astrofísica de La Plata
Materia
Ciencias Astronómicas
binaries: spectroscopic
stars: fundamental parameters
stars: individual: WR 68a
stars: Wolf-Rayet
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/86395
Acceder
id SEDICI_cd5c12da5b8fbd30bdac3b917d02f774
oai_identifier_str oai:sedici.unlp.edu.ar:10915/86395
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling A new massive double-lined spectroscopic binary system: The Wolf-Rayet star WR 68aCollado, A.Gamen, Roberto ClaudioBarbá, Rodolfo HéctorMorrell, Nidia IreneCiencias Astronómicasbinaries: spectroscopicstars: fundamental parametersstars: individual: WR 68astars: Wolf-RayetDouble-lined spectroscopic binary systems, containing a Wolf-Rayet and a massive O-type star, are key objects for the study of massive star evolution because these kinds of systems allow the determination of fundamental astrophysical parameters of their components. We have performed spectroscopic observations of the star WR 68a as part of a dedicated monitoring program of WR stars to discover new binary systems. We identified spectral lines of the two components of the system and disentangled the spectra. We measured the radial velocities in the separated spectra and determined the orbital solution. We discovered that WR 68a is a double-lined spectroscopic binary with an orbital period of 5.2207 days, very small or null eccentricity, and inclination ranging between 75 and 85 deg. We classified the binary components as WN6 and O5.5-6. The WN star is less massive than the O-type star with minimum masses of 15 ± 5 M<sub>⊙</sub> and 30 ± 4 M<sub>⊙</sub>, respectively. The equivalent width of the He II λ4686 emission line shows variations with the orbital phase, presenting a minimum when the WN star is in front of the system. The light curve constructed from available photometric data presents minima in both conjunctions of the system.Facultad de Ciencias Astronómicas y GeofísicasInstituto de Astrofísica de La Plata2015info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/86395enginfo:eu-repo/semantics/altIdentifier/issn/0004-6361info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201424863info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-03T10:49:12Zoai:sedici.unlp.edu.ar:10915/86395Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-03 10:49:12.777SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv A new massive double-lined spectroscopic binary system: The Wolf-Rayet star WR 68a
title A new massive double-lined spectroscopic binary system: The Wolf-Rayet star WR 68a
spellingShingle A new massive double-lined spectroscopic binary system: The Wolf-Rayet star WR 68a
Collado, A.
Ciencias Astronómicas
binaries: spectroscopic
stars: fundamental parameters
stars: individual: WR 68a
stars: Wolf-Rayet
title_short A new massive double-lined spectroscopic binary system: The Wolf-Rayet star WR 68a
title_full A new massive double-lined spectroscopic binary system: The Wolf-Rayet star WR 68a
title_fullStr A new massive double-lined spectroscopic binary system: The Wolf-Rayet star WR 68a
title_full_unstemmed A new massive double-lined spectroscopic binary system: The Wolf-Rayet star WR 68a
title_sort A new massive double-lined spectroscopic binary system: The Wolf-Rayet star WR 68a
dc.creator.none.fl_str_mv Collado, A.
Gamen, Roberto Claudio
Barbá, Rodolfo Héctor
Morrell, Nidia Irene
author Collado, A.
author_facet Collado, A.
Gamen, Roberto Claudio
Barbá, Rodolfo Héctor
Morrell, Nidia Irene
author_role author
author2 Gamen, Roberto Claudio
Barbá, Rodolfo Héctor
Morrell, Nidia Irene
author2_role author
author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
binaries: spectroscopic
stars: fundamental parameters
stars: individual: WR 68a
stars: Wolf-Rayet
topic Ciencias Astronómicas
binaries: spectroscopic
stars: fundamental parameters
stars: individual: WR 68a
stars: Wolf-Rayet
dc.description.none.fl_txt_mv Double-lined spectroscopic binary systems, containing a Wolf-Rayet and a massive O-type star, are key objects for the study of massive star evolution because these kinds of systems allow the determination of fundamental astrophysical parameters of their components. We have performed spectroscopic observations of the star WR 68a as part of a dedicated monitoring program of WR stars to discover new binary systems. We identified spectral lines of the two components of the system and disentangled the spectra. We measured the radial velocities in the separated spectra and determined the orbital solution. We discovered that WR 68a is a double-lined spectroscopic binary with an orbital period of 5.2207 days, very small or null eccentricity, and inclination ranging between 75 and 85 deg. We classified the binary components as WN6 and O5.5-6. The WN star is less massive than the O-type star with minimum masses of 15 ± 5 M<sub>⊙</sub> and 30 ± 4 M<sub>⊙</sub>, respectively. The equivalent width of the He II λ4686 emission line shows variations with the orbital phase, presenting a minimum when the WN star is in front of the system. The light curve constructed from available photometric data presents minima in both conjunctions of the system.
Facultad de Ciencias Astronómicas y Geofísicas
Instituto de Astrofísica de La Plata
description Double-lined spectroscopic binary systems, containing a Wolf-Rayet and a massive O-type star, are key objects for the study of massive star evolution because these kinds of systems allow the determination of fundamental astrophysical parameters of their components. We have performed spectroscopic observations of the star WR 68a as part of a dedicated monitoring program of WR stars to discover new binary systems. We identified spectral lines of the two components of the system and disentangled the spectra. We measured the radial velocities in the separated spectra and determined the orbital solution. We discovered that WR 68a is a double-lined spectroscopic binary with an orbital period of 5.2207 days, very small or null eccentricity, and inclination ranging between 75 and 85 deg. We classified the binary components as WN6 and O5.5-6. The WN star is less massive than the O-type star with minimum masses of 15 ± 5 M<sub>⊙</sub> and 30 ± 4 M<sub>⊙</sub>, respectively. The equivalent width of the He II λ4686 emission line shows variations with the orbital phase, presenting a minimum when the WN star is in front of the system. The light curve constructed from available photometric data presents minima in both conjunctions of the system.
publishDate 2015
dc.date.none.fl_str_mv 2015
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
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://sedici.unlp.edu.ar/handle/10915/86395
url http://sedici.unlp.edu.ar/handle/10915/86395
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0004-6361
info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201424863
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
_version_ 1842260368260333568
score 13.13397

Publicaciones similares