A coordinated x-ray and optical campaign of the nearest massive eclipsing binary, δ orionis Aa. III. Analysis of optical photometric (MOST) and spectroscopic (ground-based) variati...

Autores
Benvenuto, Omar Gustavo
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We report on both high-precision photometry from the Microvariability and Oscillations of Stars (MOST) space telescope and ground-based spectroscopy of the triple system δ Ori A, consisting of a binary O9.5II+early-B (Aa1 and Aa2) with P = 5.7 days, and a more distant tertiary (O9 IV years). This data was collected in concert with X-ray spectroscopy from the Chandra X-ray Observatory. Thanks to continuous coverage for three weeks, the MOST light curve reveals clear eclipses between Aa1 and Aa2 for the first time in non-phased data. From the spectroscopy, we have a well-constrained radial velocity (RV) curve of Aa1. While we are unable to recover RV variations of the secondary star, we are able to constrain several fundamental parameters of this system and determine an approximate mass of the primary using apsidal motion. We also detected second order modulations at 12 separate frequencies with spacings indicative of tidally influenced oscillations. These spacings have never been seen in a massive binary, making this system one of only a handful of such binaries that show evidence for tidally induced pulsations.
La lista completa de autores que integran el documento puede consultarse en el archivo.
Facultad de Ciencias Astronómicas y Geofísicas
Instituto de Astrofísica de La Plata
Materia
Ciencias Astronómicas
binaries: eclipsing
close
stars: early-type
stars: individual (delta Ori A)
stars: mass-loss
stars: variables: general
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:10915/86357

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network_name_str SEDICI (UNLP)
spelling A coordinated x-ray and optical campaign of the nearest massive eclipsing binary, δ orionis Aa. III. Analysis of optical photometric (MOST) and spectroscopic (ground-based) variationsBenvenuto, Omar GustavoCiencias Astronómicasbinaries: eclipsingclosestars: early-typestars: individual (delta Ori A)stars: mass-lossstars: variables: generalWe report on both high-precision photometry from the <i>Microvariability and Oscillations of Stars</i> (MOST) space telescope and ground-based spectroscopy of the triple system δ Ori A, consisting of a binary O9.5II+early-B (Aa1 and Aa2) with P = 5.7 days, and a more distant tertiary (O9 IV years). This data was collected in concert with X-ray spectroscopy from the <i>Chandra</i> X-ray Observatory. Thanks to continuous coverage for three weeks, the <i>MOST</i> light curve reveals clear eclipses between Aa1 and Aa2 for the first time in non-phased data. From the spectroscopy, we have a well-constrained radial velocity (RV) curve of Aa1. While we are unable to recover RV variations of the secondary star, we are able to constrain several fundamental parameters of this system and determine an approximate mass of the primary using apsidal motion. We also detected second order modulations at 12 separate frequencies with spacings indicative of tidally influenced oscillations. These spacings have never been seen in a massive binary, making this system one of only a handful of such binaries that show evidence for tidally induced pulsations.La lista completa de autores que integran el documento puede consultarse en el archivo.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/10915/86357enginfo:eu-repo/semantics/altIdentifier/issn/0004-637Xinfo:eu-repo/semantics/altIdentifier/doi/10.1088/0004-637X/809/2/134info: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:UNLP2025-09-29T11:16:54Zoai:sedici.unlp.edu.ar:10915/86357Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:16:54.612SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv A coordinated x-ray and optical campaign of the nearest massive eclipsing binary, δ orionis Aa. III. Analysis of optical photometric (MOST) and spectroscopic (ground-based) variations
title A coordinated x-ray and optical campaign of the nearest massive eclipsing binary, δ orionis Aa. III. Analysis of optical photometric (MOST) and spectroscopic (ground-based) variations
spellingShingle A coordinated x-ray and optical campaign of the nearest massive eclipsing binary, δ orionis Aa. III. Analysis of optical photometric (MOST) and spectroscopic (ground-based) variations
Benvenuto, Omar Gustavo
Ciencias Astronómicas
binaries: eclipsing
close
stars: early-type
stars: individual (delta Ori A)
stars: mass-loss
stars: variables: general
title_short A coordinated x-ray and optical campaign of the nearest massive eclipsing binary, δ orionis Aa. III. Analysis of optical photometric (MOST) and spectroscopic (ground-based) variations
title_full A coordinated x-ray and optical campaign of the nearest massive eclipsing binary, δ orionis Aa. III. Analysis of optical photometric (MOST) and spectroscopic (ground-based) variations
title_fullStr A coordinated x-ray and optical campaign of the nearest massive eclipsing binary, δ orionis Aa. III. Analysis of optical photometric (MOST) and spectroscopic (ground-based) variations
title_full_unstemmed A coordinated x-ray and optical campaign of the nearest massive eclipsing binary, δ orionis Aa. III. Analysis of optical photometric (MOST) and spectroscopic (ground-based) variations
title_sort A coordinated x-ray and optical campaign of the nearest massive eclipsing binary, δ orionis Aa. III. Analysis of optical photometric (MOST) and spectroscopic (ground-based) variations
dc.creator.none.fl_str_mv Benvenuto, Omar Gustavo
author Benvenuto, Omar Gustavo
author_facet Benvenuto, Omar Gustavo
author_role author
dc.subject.none.fl_str_mv Ciencias Astronómicas
binaries: eclipsing
close
stars: early-type
stars: individual (delta Ori A)
stars: mass-loss
stars: variables: general
topic Ciencias Astronómicas
binaries: eclipsing
close
stars: early-type
stars: individual (delta Ori A)
stars: mass-loss
stars: variables: general
dc.description.none.fl_txt_mv We report on both high-precision photometry from the <i>Microvariability and Oscillations of Stars</i> (MOST) space telescope and ground-based spectroscopy of the triple system δ Ori A, consisting of a binary O9.5II+early-B (Aa1 and Aa2) with P = 5.7 days, and a more distant tertiary (O9 IV years). This data was collected in concert with X-ray spectroscopy from the <i>Chandra</i> X-ray Observatory. Thanks to continuous coverage for three weeks, the <i>MOST</i> light curve reveals clear eclipses between Aa1 and Aa2 for the first time in non-phased data. From the spectroscopy, we have a well-constrained radial velocity (RV) curve of Aa1. While we are unable to recover RV variations of the secondary star, we are able to constrain several fundamental parameters of this system and determine an approximate mass of the primary using apsidal motion. We also detected second order modulations at 12 separate frequencies with spacings indicative of tidally influenced oscillations. These spacings have never been seen in a massive binary, making this system one of only a handful of such binaries that show evidence for tidally induced pulsations.
La lista completa de autores que integran el documento puede consultarse en el archivo.
Facultad de Ciencias Astronómicas y Geofísicas
Instituto de Astrofísica de La Plata
description We report on both high-precision photometry from the <i>Microvariability and Oscillations of Stars</i> (MOST) space telescope and ground-based spectroscopy of the triple system δ Ori A, consisting of a binary O9.5II+early-B (Aa1 and Aa2) with P = 5.7 days, and a more distant tertiary (O9 IV years). This data was collected in concert with X-ray spectroscopy from the <i>Chandra</i> X-ray Observatory. Thanks to continuous coverage for three weeks, the <i>MOST</i> light curve reveals clear eclipses between Aa1 and Aa2 for the first time in non-phased data. From the spectroscopy, we have a well-constrained radial velocity (RV) curve of Aa1. While we are unable to recover RV variations of the secondary star, we are able to constrain several fundamental parameters of this system and determine an approximate mass of the primary using apsidal motion. We also detected second order modulations at 12 separate frequencies with spacings indicative of tidally influenced oscillations. These spacings have never been seen in a massive binary, making this system one of only a handful of such binaries that show evidence for tidally induced pulsations.
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/10915/86357
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dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0004-637X
info:eu-repo/semantics/altIdentifier/doi/10.1088/0004-637X/809/2/134
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
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reponame_str SEDICI (UNLP)
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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
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