Gemini/GMOS detection of stellar velocity variations in the ionising cluster of 30 Dor

Autores
Bosch, Guillermo Luis; Terlevich, Elena; Terlevich, Roberto
Año de publicación
2008
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We have analysed spectra obtained with the Gemini Multi Object Spectrograph (GMOS) for more than 50 stars in the ionising cluster of 30Doradus during a seven epochs observing campaign at Gemini South. We derive a binary candidate rate of about 50%, which is however consistent with an intrinsic 100% binary rate among massive stars. After decontaminating the sample from the stars that show binary orbital motions, we were able to calculate the "true" cluster velocity dispersion and found it to be about 8 km s-1. This value implies a virial mass of about 4.5 × 10M⊙ which is consistent with previous photometric mass determinations therefore suggesting that NGC 2070 is a firm candidate for a future globular cluster.
Facultad de Ciencias Astronómicas y Geofísicas
Materia
Ciencias Astronómicas
Binaries: spectroscopic
Galaxies: individual (LMC)
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:10915/84542
Acceder
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oai_identifier_str oai:sedici.unlp.edu.ar:10915/84542
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Gemini/GMOS detection of stellar velocity variations in the ionising cluster of 30 DorBosch, Guillermo LuisTerlevich, ElenaTerlevich, RobertoCiencias AstronómicasBinaries: spectroscopicGalaxies: individual (LMC)Magellanic CloudsStars: early-typeStars: kinematicsWe have analysed spectra obtained with the Gemini Multi Object Spectrograph (GMOS) for more than 50 stars in the ionising cluster of 30Doradus during a seven epochs observing campaign at Gemini South. We derive a binary candidate rate of about 50%, which is however consistent with an intrinsic 100% binary rate among massive stars. After decontaminating the sample from the stars that show binary orbital motions, we were able to calculate the "true" cluster velocity dispersion and found it to be about 8 km s-1. This value implies a virial mass of about 4.5 × 10M⊙ which is consistent with previous photometric mass determinations therefore suggesting that NGC 2070 is a firm candidate for a future globular cluster.Facultad de Ciencias Astronómicas y Geofísicas2008info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf317-322http://sedici.unlp.edu.ar/handle/10915/84542enginfo:eu-repo/semantics/altIdentifier/issn/1743-9213info:eu-repo/semantics/altIdentifier/doi/10.1017/S1743921308028640info: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:UNLP2025-10-22T16:57:02Zoai:sedici.unlp.edu.ar:10915/84542Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-10-22 16:57:02.957SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Gemini/GMOS detection of stellar velocity variations in the ionising cluster of 30 Dor
title Gemini/GMOS detection of stellar velocity variations in the ionising cluster of 30 Dor
spellingShingle Gemini/GMOS detection of stellar velocity variations in the ionising cluster of 30 Dor
Bosch, Guillermo Luis
Ciencias Astronómicas
Binaries: spectroscopic
Galaxies: individual (LMC)
Magellanic Clouds
Stars: early-type
Stars: kinematics
title_short Gemini/GMOS detection of stellar velocity variations in the ionising cluster of 30 Dor
title_full Gemini/GMOS detection of stellar velocity variations in the ionising cluster of 30 Dor
title_fullStr Gemini/GMOS detection of stellar velocity variations in the ionising cluster of 30 Dor
title_full_unstemmed Gemini/GMOS detection of stellar velocity variations in the ionising cluster of 30 Dor
title_sort Gemini/GMOS detection of stellar velocity variations in the ionising cluster of 30 Dor
dc.creator.none.fl_str_mv Bosch, Guillermo Luis
Terlevich, Elena
Terlevich, Roberto
author Bosch, Guillermo Luis
author_facet Bosch, Guillermo Luis
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: individual (LMC)
Magellanic Clouds
Stars: early-type
Stars: kinematics
topic Ciencias Astronómicas
Binaries: spectroscopic
Galaxies: individual (LMC)
Magellanic Clouds
Stars: early-type
Stars: kinematics
dc.description.none.fl_txt_mv We have analysed spectra obtained with the Gemini Multi Object Spectrograph (GMOS) for more than 50 stars in the ionising cluster of 30Doradus during a seven epochs observing campaign at Gemini South. We derive a binary candidate rate of about 50%, which is however consistent with an intrinsic 100% binary rate among massive stars. After decontaminating the sample from the stars that show binary orbital motions, we were able to calculate the "true" cluster velocity dispersion and found it to be about 8 km s-1. This value implies a virial mass of about 4.5 × 10M⊙ which is consistent with previous photometric mass determinations therefore suggesting that NGC 2070 is a firm candidate for a future globular cluster.
Facultad de Ciencias Astronómicas y Geofísicas
description We have analysed spectra obtained with the Gemini Multi Object Spectrograph (GMOS) for more than 50 stars in the ionising cluster of 30Doradus during a seven epochs observing campaign at Gemini South. We derive a binary candidate rate of about 50%, which is however consistent with an intrinsic 100% binary rate among massive stars. After decontaminating the sample from the stars that show binary orbital motions, we were able to calculate the "true" cluster velocity dispersion and found it to be about 8 km s-1. This value implies a virial mass of about 4.5 × 10M⊙ which is consistent with previous photometric mass determinations therefore suggesting that NGC 2070 is a firm candidate for a future globular cluster.
publishDate 2008
dc.date.none.fl_str_mv 2008
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/10915/84542
url http://sedici.unlp.edu.ar/handle/10915/84542
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/1743-9213
info:eu-repo/semantics/altIdentifier/doi/10.1017/S1743921308028640
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
317-322
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
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score 12.982451

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