Physics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...250..113m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 250, no. 1, Oct. 1991, p. 113-126. Research supported by SNSF.
Physics
49
Globular Clusters, Radial Velocity, Stellar Physics, Dynamic Characteristics, Stellar Motions
Scientific paper
A multimass anisotropic dynamical model based on an assumed form of the phase-space distribution function f(E, J) is used to reproduce observations of mean radial velocities of 127 stars, members of the metal-poor globular cluster NGC 6397. The observed main sequence luminosity function, for the stars in the range 0.13-0.79 solar mass, is used as a constraint for the mass populations of the main sequence. The mean central surface brightness of NGC 6397 is 7.77 mag/arcmin, and the integrated visual magnitude equals 5.63 mag. The mean total mass of 1.0 +/-0.1 x 10 exp 5 solar mass yields a mean mass-to-light ratio of 2.1 +/-0.1. Taking into account the observed main sequence luminosity function, only models with anisotropy of the velocity dispersion agree with the observations.
Mayor Marcel
Meylan George
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