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Fig. 1


Locations of the six stars under study in the Hertzsprung–Russell diagram using luminosities that have been computed using scaling relations. The solid lines are evolutionary tracks for stellar models using a solar-calibrated mixing-length parameter and composition for mass from 1.0 to 1.5 M in steps of 0.1 M. The sample of stars are all located towards the end of the subgiant branch or at the base of the red giant branch.

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