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

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 investig...

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Detalles Bibliográficos
Autores principales: Bosch, Guillermo, Terlevich, Elena, Terlevich, Roberto
Formato: Articulo
Lenguaje:Inglés
Publicado: 2009
Materias:
Ciencias Astronómicas
Binaries: spectroscopic
Galaxies: clusters: general
Magellanic clouds
Stars: early-type
Stars: kinematics
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/82793
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-82793
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: clusters: general
Magellanic clouds
Stars: early-type
Stars: kinematics
spellingShingle Ciencias Astronómicas
Binaries: spectroscopic
Galaxies: clusters: general
Magellanic clouds
Stars: early-type
Stars: kinematics
Bosch, Guillermo
Terlevich, Elena
Terlevich, Roberto
Gemini/GMOS search for massive binaries in the ionizing cluster of 30 DOR
topic_facet Ciencias Astronómicas
Binaries: spectroscopic
Galaxies: clusters: general
Magellanic clouds
Stars: early-type
Stars: kinematics
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.
format Articulo
Articulo
author Bosch, Guillermo
Terlevich, Elena
Terlevich, Roberto
author_facet Bosch, Guillermo
Terlevich, Elena
Terlevich, Roberto
author_sort Bosch, Guillermo
title Gemini/GMOS search for massive binaries in the ionizing cluster of 30 DOR
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
publishDate 2009
url http://sedici.unlp.edu.ar/handle/10915/82793
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AT terlevichroberto geminigmossearchformassivebinariesintheionizingclusterof30dor
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