The Luminosity Function and Radial Profile of the Stellar Population in the Core of 47 Tucanae

Details The Luminosity Function and Radial Profile of the Stellar Population in the Core of 47 Tucanae The Luminosity Function and Radial Profile of the Stellar Population in the Core of 47 Tucanae

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...18510417p&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #104.17; Bulletin of the American Astronomical Society, Vol. 26, p.1491

Astronomy and Astrophysics

Astronomy

Scientific paper

The core of the galactic globular cluster 47 Tucanae was observed by the Faint Object Camera on the refurbished Hubble Space Telescope for the first time through narrow band F253M and F346M filters centered at 253 nm and 346 nm. A total of 511 stars down to the detection limit at m346 =~ 24 in the 7('') times 7('') field were accurately placed on a m346 vs m253-m346 color magnitude diagram to characterize the stellar populations in the core. Approximately 100 objects above and to the right of the main sequence turn-off are the same as those classified earlier with the aberrated HST but the rest below it are new objects seen now for the first time thanks to the substantial improvement in sensitivity. The new objects form a well defined main sequence whose luminosity function turns over dramatically at m346 =~ 20 well before the completeness limit and well before the end of the slowly increasing luminosity function for the outer fields measured from the ground by Hesser et al. (1987). We interpret this premature drop in the number of stars below ~ 0.7 M_sun in the core as the effect of mass segregation due to two body relaxation. The position of 9 objects in the range 20< m346<24 and -1.5

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