Fig. 19.

Stellar evolution of a binary corresponding to β Lyr A. The component radii R1, R2 vs. the primary mass M1 are plotted (top), with observed values indicated by full circles, together with the distance a and R1, R2 vs. time t (middle); see horizontal dashed lines, and surface abundances X, Y, AC12, AO16 vs. time t (bottom). At t = 19.613 × 106 yr, the mass ratio q corresponds to the observed one.
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