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

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%...

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Detalles Bibliográficos
Autores principales: Bosch, Guillermo Luis, Terlevich, Elena, Terlevich, Roberto
Formato: Articulo
Lenguaje:Inglés
Publicado: 2008
Materias:
Ciencias Astronómicas
Binaries: spectroscopic
Galaxies: individual (LMC)
Magellanic Clouds
Stars: early-type
Stars: kinematics
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84542
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84542
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Binaries: spectroscopic
Galaxies: individual (LMC)
Magellanic Clouds
Stars: early-type
Stars: kinematics
spellingShingle Ciencias Astronómicas
Binaries: spectroscopic
Galaxies: individual (LMC)
Magellanic Clouds
Stars: early-type
Stars: kinematics
Bosch, Guillermo Luis
Terlevich, Elena
Terlevich, Roberto
Gemini/GMOS detection of stellar velocity variations in the ionising cluster of 30 Dor
topic_facet Ciencias Astronómicas
Binaries: spectroscopic
Galaxies: individual (LMC)
Magellanic Clouds
Stars: early-type
Stars: kinematics
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.
format Articulo
Articulo
author Bosch, Guillermo Luis
Terlevich, Elena
Terlevich, Roberto
author_facet Bosch, Guillermo Luis
Terlevich, Elena
Terlevich, Roberto
author_sort Bosch, Guillermo Luis
title Gemini/GMOS detection of stellar velocity variations in the ionising cluster of 30 Dor
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
publishDate 2008
url http://sedici.unlp.edu.ar/handle/10915/84542
work_keys_str_mv AT boschguillermoluis geminigmosdetectionofstellarvelocityvariationsintheionisingclusterof30dor
AT terlevichelena geminigmosdetectionofstellarvelocityvariationsintheionisingclusterof30dor
AT terlevichroberto geminigmosdetectionofstellarvelocityvariationsintheionisingclusterof30dor
bdutipo_str Repositorios
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