Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93..856c&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 93, April 1987, p. 856-863. NSF-supported research.
Astronomy and Astrophysics
Astronomy
19
Astrometry, Globular Clusters, Stellar Motions, Stellar Spectrophotometry, Ultraviolet Spectra, Astronomical Catalogs, Color-Magnitude Diagram, Star Distribution
Scientific paper
Proper motions and photometry have been obtained for 301 stars down to V = about 16 in the region of the globular cluster M2. Membership probabilities derived from the proper motions show that over 200 of these stars are highly probable cluster members, including a number of UV-bright stars. A few stars suspected of being field stars in a recent dynamical study of the cluster of Pryor et al. (1986) are confirmed to be nonmembers. The internal proper-motion dispersion has been detected and is clearly isotropic out to about 3 arcmin from the cluster center. The proper-motion and radial-velocity dispersions have been equated to yield a distance of 11.0 + or - 1.7 kpc independent of any standard-candle assumptions. An accurate position of the cluster center has been measured that differs markedly from that found by Shawl and White (1986). A large space velocity has been derived for the cluster.
Cudworth Kyle McC.
Rauscher Bernard J.
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