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

G. Meylan, P. Dubath, M. Mayor
1991 Symposium - International astronomical union  
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
more » ... ined for the total mass of the cluster range from 0.36 to 1.44 106M⊙, corresponding to mass-to-light ratiosM/LVranging from 1.2 to 4.2 (M/LV)⊙, values typical of galactic globular clusters.
doi:10.1017/s0074180900200405 fatcat:xvojq43h2nhtbfdh5lrl4fvjmq