Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21715226h&link_type=abstract
American Astronomical Society, AAS Meeting #217, #152.26; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Multi-epoch observations with ACS on HST provide a unique and comprehensive probe of stellar dynamics within NGC 6397. We are able to confront analytic, Monte Carlo and nbody models of the globular cluster with the observed stellar proper motions . The observations probe well along the main sequence from 0.5 to below 0.1 solar masses as well as white dwarfs younger than one gigayear. The observed field lies beyond the half-light radius where standard models of globular cluster dynamics (e.g. based on a lowered Maxwellian velocity distribution) make very robust predictions for the stellar proper motions as a function of mass. The observations agree with the models for the main sequence stars; however, the proper motions of the young white dwarfs are somewhat puzzling, and we examine some possible explanations.
Anderson Jeffrey
Dotter Aaron
Fahlman Gregory G.
Hansen Brad
Heyl Jeremy S.
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