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Color-magnitude diagrams for three distant globular clusters
Color-magnitude diagrams are presented for three distant galactic globular clusters (NGC 5466, NGC 6229, and NGC 7006). In each case the photometry reaches below the main-sequence turnoff; the ages deduced by comparison with stellar evolutionary isochrones are indistinguishable from those of the well-studied nearby clusters. The luminosity functions derived from computer-generated star counts complete to a well-defined limiting magnitude in selected fields support identical ages for the threedoi:10.1086/113929 fatcat:rjoa5fbg4vhbnmwf7enukagjem