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The dynamics of the globular cluster M22 (NGC 6656)

Published online by Cambridge University Press:  11 March 2020

D. Chen Open the ORCID record for D. Chen [Opens in a new window] ,
L. Chen  and
J. J. Wang
D. Chen
Affiliation:
China Academy of Space Technology, 100086, Beijing, China email:[email protected]
L. Chen
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, 200030Shanghai, China email: [email protected]
J. J. Wang
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, 200030Shanghai, China email: [email protected]
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Abstract

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We have used the Hubble Space Telescope (HST) observations to measure proper motion of the globular cluster NGC 6656 (M22) with respect to the background bulge stars and its internal velocity dispersion profile. Based on the proper motion of the clusters, its space velocity and orbit are also calculated. The central velocity dispersion in radial and tangential components of the internal 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 works.

Keywords

astrometryproper motionglobular clusters: dynamicsglobular clusters: individual: NGC 6656(M22)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S351: Star Clusters: From the Milky Way to the Early Universe , May 2019 , pp. 422 - 425
Copyright
© International Astronomical Union 2020

Footnotes

†

Based on observations with the NASA/ESA Hubble Space Telescope obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under NASA contrct NAS5-26555.

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