Low-mass stars in globular clusters. III. The mass function of 47 Tucanae.

Details Low-mass stars in globular clusters. III. The mass function of 47 Tucanae. Low-mass stars in globular clusters. III. The mass function of 47 Tucanae.

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...304..211d&link_type=abstract

Astronomy and Astrophysics, v.304, p.211

Astronomy and Astrophysics

Astrophysics

47

Globular Clusters: Individual (Ngc 104), Hertzprung-Russell (Hr) Diagram, Stars: Low-Mass, Brown Dwarfs, Stars: Luminosity Function, Mass Function

Scientific paper

We have used the WFPC2 on board HST to investigate the stellar population in a field located 4'6 E of the center of the globular cluster 47 Tuc (NGC 104), close to the half-mass radius, through wide band imaging at 606 and 812nm. A total of ~3000 stars are accurately classified by two-color photometry to form a color-magnitude diagram extending down to a limiting magnitude m_814_=~m_I_=~24. A rich cluster main sequence is detected spanning the range from m_814_=~18 through m_814_=~23, where it spreads considerably due to the increasing photometric uncertainty and galaxy contamination. A secondary sequence of objects is also detected, parallel to the main sequence, as expected for a population of binary stars. The measured binary fraction in the range 195%. The main sequence luminosity function obtained from the observed CMD increases with decreasing luminosity following a power-law trend with index α=~0.15 in the range 5

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