Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pabei..18...75w&link_type=abstract
Prog. Astron., Vol. 18, No. 1, p. 75 - 82
Astronomy and Astrophysics
Astronomy
1
Globular Clusters: Space Motions, Globular Clusters: Galaxy
Scientific paper
Globular clusters are one of the most ancient objects in the Galaxy. They are very important tracers in the Galactic halo due to their high accumulated luminosity. Today, about more than 140 globular clusters in the Galaxy are observed. Radial velocities of 120 globular clusters within galactocentric distances R < 40 kpc are accurately determined. These globular clusters can be subdivided into some groups based on their radial velocities and metallicities. Up to now, only 38 globular cluster's absolute proper motions are determined. The accuracy of these values is much lower than that of the radial velocities and distances. Using these data above, however, some interesting results have been attained from the three-dimensional space motions of globular clusters. At present, it become possible to determine the absolute proper motions of globular clusters based on the International Celestial Reference frame, optically represented by the new reference frame established by Hipparcos. It is of importance for the study of space motions of globular clusters and of the structure and earlier evolution of the Galaxy.
Li Chen
Wang Jiaji
Wu Zhenyu
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