Hubble Space Telescope Photometry of the Metal-rich Globular Clusters NGHC 6624 and NGC 6637
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Heasley, J
Janes, K
Zinn, Robert
Demarque, Pierre
Da Costa, Gary
Christian, C
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University of Chicago Press
Abstract
We have observed the metal-rich globular clusters NGC 6624 and NGC 6637 (M69) using the planetary camera of the WFPC2 on the Hubble Space Telescope (HST). Observations of the Ca II triplet lines in giant stars in these clusters show that NGC 6624 and NGC
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Astronomical Journal