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Blue stragglers in the core of the globular cluster 47 Tucanae

Boksenberg, A.; Barbieri, C.; Weigelt, G. +18 more

High-resolution observations of the core of the globular cluster 47 Tucanae with the Faint Object Camera on the Hubble Space Telescope reveal a high density of 'blue straggler' stars, occupying the upper end of the main sequence from which all stars in the cluster should have long since evolved. Their presence in the dense core supports the hypoth…