---
res:
  bibo_abstract:
  - "Multi-epoch observations with the Advanced Camera Survey and WFC3 on the Hubble
    Space Telescope provide a unique and comprehensive probe of stellar dynamics within
    47 Tucanae. We confront analytic models of the globular cluster with the observed
    stellar proper motions that probe along the main sequence from just above 0.8–0.1M⊙
    as well as white dwarfs younger than 1 Gyr. One field lies just beyond the half-light
    radius where dynamical models (e.g., lowered Maxwellian distributions) make robust
    predictions for the stellar proper motions. The observed proper motions in this
    outer field show evidence for anisotropy in the velocity distribution as well
    as skewness; the latter is evidence of rotation. The measured velocity dispersions
    and surface brightness distributions agree in detail with a rotating anisotropic
    model of the stellar distribution function with mild dependence of the proper-motion
    dispersion on mass. However, the best-fitting models underpredict the rotation
    and skewness of the stellar velocities. In the second field, centered on the core
    of the cluster, the mass segregation in proper motion is much stronger. Nevertheless
    the model developed in the outer field can be extended inward by taking this mass
    segregation into account in a heuristic fashion. The proper motions of the main-sequence
    stars yield a mass estimate of the cluster of \r\n at a distance of 4.7 kpc. By
    comparing the proper motions of a sample of giant and subgiant stars with the
    observed radial velocities we estimate the distance to the cluster kinematically
    to be 4.29 ± 0.47 kpc.@eng"
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: J.
      foaf_name: Heyl, J.
      foaf_surname: Heyl
  - foaf_Person:
      foaf_givenName: Ilaria
      foaf_name: Caiazzo, Ilaria
      foaf_surname: Caiazzo
      foaf_workInfoHomepage: http://www.librecat.org/personId=8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d
    orcid: 0000-0002-4770-5388
  - foaf_Person:
      foaf_givenName: H.
      foaf_name: Richer, H.
      foaf_surname: Richer
  - foaf_Person:
      foaf_givenName: J.
      foaf_name: Anderson, J.
      foaf_surname: Anderson
  - foaf_Person:
      foaf_givenName: J.
      foaf_name: Kalirai, J.
      foaf_surname: Kalirai
  - foaf_Person:
      foaf_givenName: J.
      foaf_name: Parada, J.
      foaf_surname: Parada
  bibo_doi: 10.3847/1538-4357/aa974f
  bibo_issue: '2'
  bibo_volume: 850
  dct_date: 2017^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/0004-637X
  - http://id.crossref.org/issn/1538-4357
  dct_language: eng
  dct_publisher: American Astronomical Society@
  dct_subject:
  - Space and Planetary Science
  - Astronomy and Astrophysics
  dct_title: 'Deep HST imaging in 47 Tucanae: A global dynamical model@'
...