Mass Segregation in the Globular Cluster NGC 6397

Details Mass Segregation in the Globular Cluster NGC 6397 Mass Segregation in the Globular Cluster NGC 6397

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...452l..33k&link_type=abstract

Astrophysical Journal Letters v.452, p.L33

Astronomy and Astrophysics

Astronomy

54

Galaxy: Globular Clusters: General, Galaxy: Globular Clusters: Individual Ngc Number: Ngc 6397, Celestial Mechanics, Stellar Dynamics

Scientific paper

Our deep HST images of the center of the globular cluster NGC 6397 are almost devoid of faint stars, implying that these stars must be much less concentrated to the cluster center than the brighter stars. This difference is an expected consequence of energy exchanges through stellar encounters, which give higher velocities to lower mass stars and cause them to have a larger average distance from the cluster center. The amount of segregation that we observe is consistent with the predictions of a multimass model in dynamical equilibrium.

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