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The Global Mass Function of M15

The Global Mass Function of M15

Publication date: 14 December 2004

Authors: Pasquali, A., et al.

Journal: Astronomy & Astrophysics
Volume: 428
Issue: 3
Page: 469
Year: 2004

Copyright: ESO

Data obtained with the NICMOS instrument on board the Hubble Space Telescope (HST) have been used to determine the H-band luminosity function (LF) and mass function (MF) of three stellar fields in the globular cluster M15, located ~7' from the cluster centre. The data confirm that the cluster MF has a characteristic mass of ~0.3 Msolar, as obtained by Paresce & De Marchi (2000) for a stellar field at 4.6' from the centre. By combining the present data with those published by other authors for various radial distances (near the centre, at 20" and at 4.6'), we have studied the radial variation of the LF due to the effects of mass segregation and derived the global mass function (GMF) using the Michie-King approach.

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