Level of helium enhancement among M3’s horizontal branch stars

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Fig. 7

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M3 HB stars compared to theoretical HB models with Z = 0.001 in the Strömgren u vs. (u − y) plane. Lines have the same meaning as in Fig. 1. Red and blue points represent the RHB and BHB stars, respectively, that are used to obtain the distance modulus in Fig. 6.

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