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NGC 6681 is a collapsed core globular cluster with a power-law visible surface brightness profile. Far ultraviolet images obtained with WFPC-2 show a sparsely populated central region fully resolved into stars. A far ultraviolet to visible color magnitude diagram shows a well-defined horizontal branch with no evidence for evolved descendents. The blue horizontal branch stars are less centrally concentrated than the visible light. The center possibly harbors two blue stragglers.
Thursday program listing