Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-11-19
Astronomy and Astrophysics
Astrophysics
14 pages, 17 figures, to appear in Astronomy and Astrophysics. corrected some typos on Dec 17, 1998
Scientific paper
Deep images of the galactic globular cluster M4 taken at various locations with the NIC3 and the WFPC2 cameras on HST were used to derive detailed local optical and near IR luminosity functions. White dwarfs have been detected for the first time on a color sequence at constant luminosity in the F110W band. Transformation of the observed luminosity functions into mass functions via the most up to date theoretical mass luminosity relations currently available results in best fit local mass functions, that consist of a power-law with single exponent x = -0.8 for the inner regions and a two-segment power-law which rises with x = 1 down to M_{814}=8.5 and then drops all the way to the detection limit with x = -0.3 for the outer regions.
de Marchi Guido
Paresce Francesco
Pulone Luigi
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