Dynamics of Globular Clusters

Details Dynamics of Globular Clusters Dynamics of Globular Clusters

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt........13g&link_type=abstract

PhD Dissertation, Rutgers - The State Univ. New Brunswick, NJ United States

Physics

2

Globular Clusters, Radial Velocity, Velocity Measurement, Stellar Evolution, Stellar Rotation, Brightness, Stellar Physics, Astrodynamics, Brightness Distribution, Imaging Techniques, Line Spectra, Spectrophotometers, Velocity Distribution, Stellar Spectra

Scientific paper

I have studied the dynamics of globular clusters using individual stellar velocities and the integrated light of the central 10 sec. The velocity measurements are obtained using an imaging Fabry-Perot spectrophotometer. This is the first time that stellar radial velocities have been measured using absorption lines with a Fabry-Perot.I have outlined the observing and analysis procedures. For the clusters which I have studied with the Fabry-Perot, the number of stars with measured velocities in the central 1 min have been increased by factors of 10-30. this new wealth of data allows for a more detailed dynamical analysis than has been previously possible. I present velocity dispersion profiles and rotation properties for four clusters. I have developed non-parametric models using the velocity dispersion and surface brightness profiles. These show that the parametric models which have been used for globular clusters miss important information. These non-parametric models can be compared with existing theories to place strong constraints on the underlying properties, such as the mass density profile and the mass function.

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