Star counts in NGC 6397

1 December 1993

journal article
Published by American Astronomical Society in The Astronomical Journal

Vol. 106, 2335
https://doi.org/10.1086/116805

Abstract

I-band CCD images of a large area of the nearby globular cluster NGC~6397 have been used to construct a surface density profile and two luminosity and mass functions. The surface density profile extends out to 14arcm from the cluster center and shows no sign of a tidal cutoff. The inner profile is a power-law with slope -0.8 steepening to -1.7 outside of 1arcm. The mass functions are for fields at 4arcm and 11arcm from the cluster center and confirm the upturn in the mass function for stars less massive than about 0.4 Msolar. There appears to be an excess of low-mass stars over higher-mass stars in the outer field with respect to the inner, in qualitative agreement with expectations for mass segregation.Comment: 16 pages + 7 pages of tables, LaTeX using AASTeX macros, 11 figures available by request, IoA preprin

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