Far Ultraviolet Imaging of the Core of NGC 6681 with WFPC-2

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Session 58 -- The Galaxy
Display presentation, Thursday, 2, 1994, 9:20-6:30

[58.17] Far Ultraviolet Imaging of the Core of NGC 6681 with WFPC-2

J.R.~Mould, A.M.~Watson, J.S.~Gallagher, G.~Ballester, C.J.~Burrows, S.~Casertano, J.~Clarke, D.~Crisp, J.J.~Hester, J.G.~Hoessel, J.A.~Holtzman, R.E.~Griffiths, J.~Krist, P.~Scowen, K.R.~Stapelfeldt, J.T.~Trauger, and J.A.~Westphal (WFPC-2 Science Team)

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.

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