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.
Información general
Fecha de publicación:2008
Idioma del documento:Inglés
Revista:Proceedings of the International Astronomical Union; vol. 4, no. S256
Evento:IAU Symposium 256 (Keele, Staffordshire, UK, July 28-August 1, 2008)
Institución de origen:Facultad de Ciencias Astronómicas y Geofísicas
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