Gemini/GMOS search for massive binaries in the ionizing cluster of 30 DOR

Autores
Bosch, Guillermo; Terlevich, Elena; Terlevich, Roberto
Año de publicación
2009
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
If binaries are common among massive stars, it will have important consequences for the derivation of fundamental properties such as the cluster age, initial mass function, and dynamical mass. Making use of the multiplexing facilities of the Gemini Multi-Object Spectrograph, we were able to investigate the presence of binary stars within the ionizing cluster of 30 Doradus. From a seven-epoch observing campaign at Gemini South we detect a binary candidate rate of about 50%, which is consistent with an intrinsic 100% binary rate among massive stars. We find that single-epoch determinations of the velocity dispersion give values around 30 kms-1. After correcting the global velocity dispersion for the binary orbital motions, the "true" cluster velocity dispersion is 8.3 kms-1. This value implies a virial mass of about 4.5 × 105 M or 8% of the mass calculated using the single-epoch value. The binary corrected virial mass estimate is consistent with photometric mass determinations, thus suggesting that NGC2070 is a firm candidate for a future globular cluster.
Facultad de Ciencias Astronómicas y Geofísicas
Materia
Ciencias Astronómicas
Binaries: spectroscopic
Galaxies: clusters: general
Magellanic clouds
Stars: early-type
Stars: kinematics
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:10915/82793

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network_name_str SEDICI (UNLP)
spelling Gemini/GMOS search for massive binaries in the ionizing cluster of 30 DORBosch, GuillermoTerlevich, ElenaTerlevich, RobertoCiencias AstronómicasBinaries: spectroscopicGalaxies: clusters: generalMagellanic cloudsStars: early-typeStars: kinematicsIf binaries are common among massive stars, it will have important consequences for the derivation of fundamental properties such as the cluster age, initial mass function, and dynamical mass. Making use of the multiplexing facilities of the Gemini Multi-Object Spectrograph, we were able to investigate the presence of binary stars within the ionizing cluster of 30 Doradus. From a seven-epoch observing campaign at Gemini South we detect a binary candidate rate of about 50%, which is consistent with an intrinsic 100% binary rate among massive stars. We find that single-epoch determinations of the velocity dispersion give values around 30 kms-1. After correcting the global velocity dispersion for the binary orbital motions, the "true" cluster velocity dispersion is 8.3 kms-1. This value implies a virial mass of about 4.5 × 105 M or 8% of the mass calculated using the single-epoch value. The binary corrected virial mass estimate is consistent with photometric mass determinations, thus suggesting that NGC2070 is a firm candidate for a future globular cluster.Facultad de Ciencias Astronómicas y Geofísicas2009info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf3437-3441http://sedici.unlp.edu.ar/handle/10915/82793enginfo:eu-repo/semantics/altIdentifier/issn/0004-6256info:eu-repo/semantics/altIdentifier/doi/10.1088/0004-6256/137/2/3437info: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:UNLP2025-09-29T11:15:36Zoai:sedici.unlp.edu.ar:10915/82793Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:15:36.328SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Gemini/GMOS search for massive binaries in the ionizing cluster of 30 DOR
title Gemini/GMOS search for massive binaries in the ionizing cluster of 30 DOR
spellingShingle Gemini/GMOS search for massive binaries in the ionizing cluster of 30 DOR
Bosch, Guillermo
Ciencias Astronómicas
Binaries: spectroscopic
Galaxies: clusters: general
Magellanic clouds
Stars: early-type
Stars: kinematics
title_short Gemini/GMOS search for massive binaries in the ionizing cluster of 30 DOR
title_full Gemini/GMOS search for massive binaries in the ionizing cluster of 30 DOR
title_fullStr Gemini/GMOS search for massive binaries in the ionizing cluster of 30 DOR
title_full_unstemmed Gemini/GMOS search for massive binaries in the ionizing cluster of 30 DOR
title_sort Gemini/GMOS search for massive binaries in the ionizing cluster of 30 DOR
dc.creator.none.fl_str_mv Bosch, Guillermo
Terlevich, Elena
Terlevich, Roberto
author Bosch, Guillermo
author_facet Bosch, Guillermo
Terlevich, Elena
Terlevich, Roberto
author_role author
author2 Terlevich, Elena
Terlevich, Roberto
author2_role author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
Binaries: spectroscopic
Galaxies: clusters: general
Magellanic clouds
Stars: early-type
Stars: kinematics
topic Ciencias Astronómicas
Binaries: spectroscopic
Galaxies: clusters: general
Magellanic clouds
Stars: early-type
Stars: kinematics
dc.description.none.fl_txt_mv If binaries are common among massive stars, it will have important consequences for the derivation of fundamental properties such as the cluster age, initial mass function, and dynamical mass. Making use of the multiplexing facilities of the Gemini Multi-Object Spectrograph, we were able to investigate the presence of binary stars within the ionizing cluster of 30 Doradus. From a seven-epoch observing campaign at Gemini South we detect a binary candidate rate of about 50%, which is consistent with an intrinsic 100% binary rate among massive stars. We find that single-epoch determinations of the velocity dispersion give values around 30 kms-1. After correcting the global velocity dispersion for the binary orbital motions, the "true" cluster velocity dispersion is 8.3 kms-1. This value implies a virial mass of about 4.5 × 105 M or 8% of the mass calculated using the single-epoch value. The binary corrected virial mass estimate is consistent with photometric mass determinations, thus suggesting that NGC2070 is a firm candidate for a future globular cluster.
Facultad de Ciencias Astronómicas y Geofísicas
description If binaries are common among massive stars, it will have important consequences for the derivation of fundamental properties such as the cluster age, initial mass function, and dynamical mass. Making use of the multiplexing facilities of the Gemini Multi-Object Spectrograph, we were able to investigate the presence of binary stars within the ionizing cluster of 30 Doradus. From a seven-epoch observing campaign at Gemini South we detect a binary candidate rate of about 50%, which is consistent with an intrinsic 100% binary rate among massive stars. We find that single-epoch determinations of the velocity dispersion give values around 30 kms-1. After correcting the global velocity dispersion for the binary orbital motions, the "true" cluster velocity dispersion is 8.3 kms-1. This value implies a virial mass of about 4.5 × 105 M or 8% of the mass calculated using the single-epoch value. The binary corrected virial mass estimate is consistent with photometric mass determinations, thus suggesting that NGC2070 is a firm candidate for a future globular cluster.
publishDate 2009
dc.date.none.fl_str_mv 2009
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
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info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/82793
url http://sedici.unlp.edu.ar/handle/10915/82793
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0004-6256
info:eu-repo/semantics/altIdentifier/doi/10.1088/0004-6256/137/2/3437
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
3437-3441
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instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
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instname_str Universidad Nacional de La Plata
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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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