Space motions of globular clusters NGC 362 and NGC 6218 (M12)

Details Space motions of globular clusters NGC 362 and NGC 6218 (M12) Space motions of globular clusters NGC 362 and NGC 6218 (M12)

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102.2022b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 102, Dec. 1991, p. 2022-2027. Research supported by BMFT.

Astronomy and Astrophysics

Astronomy

29

Globular Clusters, Milky Way Galaxy, Stellar Motions, Astrometry, Galactic Evolution, Magellanic Clouds

Scientific paper

The absolute proper motions of NGC 6218 (M12) were measured against distant galaxies and of NGC 362 against stars of the Small Magellanic Cloud (typical accuracy +/-0.13 arcsec/cent). The results are combined with those of the two studied clusters NGC 4147 and NGC 5466. A variety of parameters is determined within the approximation of a simple Galactic potential, including the description of the last transits of the clusters through the main plane of the Galaxy. The path of the orbits in a meridional section (based on a more refined potential) is provided for the last 10 billion yr. Attention is given to orbits with north-south asymmetry, as exemplified by the tube orbit of NGC 4147.

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