IALP   13078
INSTITUTO DE ASTROFISICA LA PLATA
Unidad Ejecutora - UE
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.