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Paper: HB theory and observations - New data on M3 and M13
Volume: 13, The Formation and Evolution of Star Clusters
Page: 253
Authors: Crocker, Deborah A.
Abstract: New data on M3 and M13 from a project to determine the origin of the multiple populations of stars on the horizontal branch (HB) of globular cluster are discussed. A very narrow well-defined sequence of cooler blue HB stars in M3 is reported which opens the possibility of an alternative test to verify the Sandage period shift.
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