Near-infrared photometry of red giant and horizontal branch stars in M4
Near-infrared photometry for the red-giant and horizontal branches in M4, obtained with the InSb detector mounted on the 1.54-m Tenerife Infrared flux collector, are presented. The red giant branch is shown to be displaced from the corresponding trend for M92, confirming earlier work, and implying an intermediate to high cluster metallicity. The
Phillips, J. P. et al.
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