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Dynamical study of the LMC globular cluster NGC 1978 from core velocity dispersion

Published online by Cambridge University Press:  19 July 2016

G. Meylan
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
P. Dubath
Affiliation:
Observatoire de Genève, CH-1290 Sauverny, Switzerland
M. Mayor
Affiliation:
Observatoire de Genève, CH-1290 Sauverny, Switzerland

Abstract

The projected velocity dispersion in the core of the Large Magellanic Cloud (LMC) intermediate-age globular cluster NGC 1978 is deduced from integrated light spectra. A numerical cross-correlation technique gives a projected velocity dispersion σp(core) = 5.8±1.2 km s−1. Multimass anisotropic King-Michie dynamical models are applied to the observational constraints given by the surface brightness profile and the above central projected velocity dispersion. Depending on the model, the values obtained for the total mass of the cluster range from 0.36 to 1.44 106 M , corresponding to mass-to-light ratios M/LV ranging from 1.2 to 4.2 (M/LV ), values typical of galactic globular clusters.

Type
Star Formation and Clustering
Copyright
Copyright © Kluwer 1991 

References

Baranne, A., Mayor, M., Poncet, J.L. (1979), Vistas in Astronomy 23, 279.CrossRefGoogle Scholar
Dubath, P., Meylan, G., Mayor, M. (1990), Astron. Astrophys. in press.Google Scholar
Gunn, J.E., Griffin, R.F. (1979), Astron. J. 84, 752.CrossRefGoogle Scholar
Illingworth, G.D. (1973), PhD Thesis, Australian National University, Australia.Google Scholar
Mateo, M. (1987), PhD Thesis, University of Washington, USA.Google Scholar
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