Member counts - A new method to constrain the tidal radii of globular clusters

Details Member counts - A new method to constrain the tidal radii of globular clusters Member counts - A new method to constrain the tidal radii of globular clusters

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...264..513t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 264, no. 2, p. 513-517.

Astronomy and Astrophysics

Astrophysics

6

Globular Clusters, Radii, Stellar Motions, Brightness Distribution, Extrapolation, Radial Distribution

Scientific paper

We test the use of counts of globular cluster members, based on proper motions, to improve the determination of their tidal radii. The observational material consists of relative proper motions for stars in large areas enclosing the globular clusters 47 Tuc and NGC 362, whose tidal radii are uncertain due to the variable background of SMC stars. For NGC 362, the member counts extend to radii larger than previous star counts. A fit of a simple King (1962) profile to the available surface brightness data and the member counts leads to a tidal radius of 9.85 +/- 0.13 arcmin (formal error). For 47 Tuc, the contamination by SMC stars is less severe, and straightforward star counts reach fainter limiting magnitudes and larger radii than the member counts.

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