2000A&A...353..944A

We present WFPC2-HST observations of the lower main sequence of the galactic globular cluster M 92 (NGC 6341), extending down to V≃27. Our data, which cover a region of the cluster extending from the very center out to r≃380arcsec, show that the slope of the luminosity function becomes flatter going towards the center of the cluster, as expected if M 92 is a dynamically relaxed system. The slope of the inferred power-law mass function we computed ranges from x≃0.7 for the field centered at r=18.61 core radii, to x≃0.3 for the annular field centered at r=10.61 core radii, where a value of 14 arcsec has been used for the core radius of M 92. Such a result, obtained without making any use of dynamical theoretical models, shows that segregation effects are at work in M 92.