Astrometry of globular clusters. I - Relative proper motions for stars in 47 Tuc. II - Relative proper motions and the space motion of NGC 362

Details Astrometry of globular clusters. I - Relative proper motions for stars in 47 Tuc. II - Relative proper motions and the space motion of NGC 362 Astrometry of globular clusters. I - Relative proper motions for stars in 47 Tuc. II - Relative proper motions and the space motion of NGC 362

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26as...93..293t&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 93, no. 2, May 1992, p. 293-310.

Astronomy and Astrophysics

Astrophysics

37

Astrometry, Galactic Clusters, Globular Clusters, Magellanic Clouds, Stellar Luminosity, Stellar Motions, Astrography, Astronomical Photometry, Metallicity

Scientific paper

The study determines relative proper motions for stars brighter than 17.0 m in a 1.5 x 1.5 deg field centered on the globular cluster 47 Tuc (NGC 104). Proper motion and membership probabilities are tabulated for 3076 stars within 32 arcmin of the cluster center. A proper motion of 47 Tuc relative to the SMC is derived, which relies on the assumption that the mean proper motion of field stars is the same as that in the nearby field of NGC 362, and on the detection of SMC stars in that field. The resulting space motion confirms the membership of 47 Tuc in the rapidly rotating, flattened, metal-rich disk subgroup of the galactic cluster system. Relative proper motions for stars centered on the globular cluster NGC 362 are determined. NGC 362 is found to exhibit a highly eccentric orbit, typical for a member of the halo subgroup of the galactic globular cluster system. The perigalactic distance of NGC 362 is very small (less than about 1 kpc).

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