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Date: 18 February 1998 Copyright: ESA Show in archive: true
Note that all spheres, representing the stars, are of the same size. Anything that appears bigger is thus physically closer to us. In the movie you will see the Hyades rotate around the Galactic Z-axis. The right image above shows the Hyades rotated over 315 degrees and some extra items are added. The green circle is the tidal radius of 10 pc and the yellow stars are members of Eggen's moving group. They are not considered members of the Hyades according to Perryman et al., but are shown here to give an impression of where one may find moving group stars. The last 20 frames of the Hyades movie show the motions of the stars within the cluster as inferred from the residual velocities with respect to the centre of mass motion of the cluster. The time steps are 50.000 years. Note that these motions are not representative of the true internal motions in the cluster. All the motions in the movie can be explained as observational errors. They are shown simply to convey the fact that velocities for all these stars are known. For details on the spatial and kinematic structure of the Hyades please refer to Perryman et al.
