Fig. 8.
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Hertzsprung-Russell diagram for the binary components. Upper panel: Models of stellar evolution according to Claret (2019) for masses of 1.6, 1.8, 2.0, and 2.5 M⊙. Bottom panel: Isochrones calculated for ages from 2 ⋅ 108 to 109 yr according to CMD 3.7 and PARSEC 2.0 models. The similarity of the primary components of the two binaries is clearly visible.
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