INVESTIGADORES
BOSCH Guillermo Luis
congresos y reuniones científicas
Título:
Gemini/GMOS detection of stellar velocity variations in the ionising cluster of 30 Dor
Autor/es:
BOSCH, GUILLERMO; TERLEVICH, ELENA; TERLEVICH, ROBERTO
Lugar:
Keele, UK
Reunión:
Simposio; IAU Symposium 256: The Magellanic System: Stars, Gas, and Galaxies; 2008
Institución organizadora:
International Astronomical Union
Resumen:
We have analysed spectra obtained with the Gemini Multi Object Spectrograph (GMOS) for more than 50 stars in the ionising cluster of 30 Doradus 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 × 105 Mȯ which is consistent with previous photometric mass determinations therefore suggesting that NGC 2070 is a firm candidate for a future globular cluster.