Low Mass Stars in an Outer Field in NGC 6397
Casertano, Stefano; Ballester, Gilda E.; Crisp, David; Holtzman, Jon A.; Trauger, John T.; Gallagher, John S., III; Hester, J. Jeff; Westphal, James A.; Mould, Jeremy R.; Hoessel, John G.; Clarke, John T.; Stapelfeldt, Karl R.; Burrows, Christopher J.; Griffiths, Richard E.; Scowen, Paul A.; Watson, Alan M.
Abstract
We have imagined a field 10' from the center of the globular cluster NGC 6397 in the visible and I bands with WFPC-2 on the HST. AT a level which is severely limited by counting statistics in the small area so far studied, this field is richer in dwarfs with I > 21.5 than the 4.6' radius parallel field discussed by Paresce and colleagues. This indicates that the dynamical process of mass segregation is occurring in the cluster. (SECTION: Stellar Clusters and Associations)