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

Published online by Cambridge University Press:  01 July 2008

Guillermo Bosch ,
Elena Terlevich  and
Roberto Terlevich
Guillermo Bosch
Affiliation:
Facultad de Ciencias Astronómicas y Geofísicas & IALP Paseo del Bosque s/n, 1900 La Plata, Argentina email: guille@fcaglp.unlp.edu.ar
Elena Terlevich
Affiliation:
INAOE, Tonantzintla, Apdo. Postal 51, 72000 Puebla, México
Roberto Terlevich
Affiliation:
INAOE, Tonantzintla, Apdo. Postal 51, 72000 Puebla, México
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Abstract

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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 M⊙ which is consistent with previous photometric mass determinations therefore suggesting that NGC 2070 is a firm candidate for a future globular cluster.

Keywords

stars: early-typestars: kinematicsbinaries: spectroscopicgalaxies: individual (LMC)Magellanic Clouds
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S256: The Magellanic System: Stars, Gas, and Galaxies , July 2008 , pp. 317 - 322
Copyright
Copyright © International Astronomical Union 2009

References

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