Other
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..681b&link_type=abstract
Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 681-686
Other
7
Scientific paper
A combination of absolute trigonometric parallaxes and proper motions from Hipparcos, and radial velocities from ground-based observations, are used to determine the position and velocity components of candidate members with respect to the Hyades cluster centre, providing new information on cluster membership. The 3-dimensional structure of the cluster is constructed and 13 new candidate members within 20 pc of the cluster centre have been identified. Further from the cluster centre there is a gradual merging between certain cluster members and field stars, both spatially and kinematically. Within the cluster, the kinematical structure is fully consistent with parallel space motion of the component stars with an internal velocity dispersion of about 0.3 km/s. The spatial structure and mass segregation are consistent with N-body simulation results, without the need to invoke expansion, contraction, rotation, or other significant perturbations of the cluster. The distance to the observed centre of mass for the objects within 10 pc of the cluster centre (corresponding to the tidal radius) is determined. This distance is close to, but significantly better determined than, that derived from recent high-precision radial velocity studies, somewhat larger than that indicated by recent ground-based trigonometric parallax determinations, and significantly smaller than recent studies of the cluster convergent point and dynamical parallaxes. These discrepancies are investigated and explained.
Brown Anthony G. A.
Kovalevsky Jean
Mermilliod Jean-Claude
Perryman Michael . A. C.
Robichon Noel
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