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The Dynamics Of Galactic Globular Cluster

Published online by Cambridge University Press:  01 April 2008

Chen Ding
Chen Ding*
Affiliation:
National Time Service Center, Chinese Academy of Science. Xi'an 710600, China email: ding@ntsc.ac.cn
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Abstract

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We have used the Hubble Space Telescope (HST) to measure proper motion of the globular cluster NGC 6656 (M22) with respect to the background bulge stars and its internal velocity dispersion profile. With the space velocity of (Π, Θ, W) = (184±3, 209±14, 132±15) km s−1, we also calculate the orbit of the cluster. The central velocity dispersion in both components of the proper motion of cluster stars is 16.99 km s−1. We derive the mass-to-ration (M/L)∼1.7 which is relatively higher than the past works.

Keywords

astrometryglobular clusters: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S252: The Art of Modeling Stars in the 21st Century , April 2008 , pp. 269 - 270
Copyright
Copyright © International Astronomical Union 2008

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