【摘 要】
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We have used the Hubble Space Telescope observations to measure proper motion of the globular cluster NGC6656 (M22) with respect to the background bulge stars a
【机 构】
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Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030
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We have used the Hubble Space Telescope observations to measure proper motion of the globular cluster NGC6656 (M22) with respect to the background bulge stars and its inteal velocity dispersion profile. Based on the proper motion of the cluster, its space velocity (II, (-) , W) = (184 ± 3, 209 ±14, 132 ± 15) km s- 1 and galactic orbit are also obtained. The central velocity dispersion in radial and tangential components of the inteal motion of cluster stars is 16.99 km s-1. We derive the mass-to-light ratio M/ LV ～ 3.3 ± 0.2, which is relatively higher than the previous results.
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