D. Butler
Abstract
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The globular-cluster metal-abundance parameter, which is the intrinsic color index at the intersection of the horizontal and subgiant branch in the color-magnitude diagram, is shown to be tightly correlated with the concentration ratio of Fe/H.
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The globular-cluster metal-abundance parameter, which is the intrinsic color index at the intersection of the horizontal and subgiant branch in the color-magnitude diagram, is shown to be tightly correlated with the concentration ratio of Fe/H.
Key concepts: Globular cluster, Subgiant, Horizontal branch, Astrophysics, Physics, Color index, Diagram, Cluster (spacecraft)