Luminosity function and mass segregation in M92

Details Luminosity function and mass segregation in M92 Luminosity function and mass segregation in M92

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...353..944a&link_type=abstract

Astronomy and Astrophysics, v.353, p.944-951 (2000)

Astronomy and Astrophysics

Astrophysics

13

Galaxy: Globular Clusters: Individual: M92, Stars: Low-Mass, Brown Dwarfs, Stars: Luminosity Function, Mass Function

Scientific paper

We present WFPC2-HST observations of the lower main sequence of the galactic globular cluster M92 (NGC6341), extending down to V ~= 27. Our data, which cover a region of the cluster extending from the very center out to r ~= 380 arcsec, show that the slope of the luminosity function becomes flatter going towards the center of the cluster, as expected if M92 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 M92. Such a result, obtained without making any use of dynamical theoretical models, shows that segregation effects are at work in M92.

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