Fig. 14.
Orbital period, as function of semi-major axis, for a circular binary system composed of an RGB primary and a 0.5 M⊙ secondary (black band). The shaded coloured bands mark, for different metallicities, the separation below which Roche lobe overflow occurs during the primary RGB evolution. The width of the bands is calculated adopting an age range of 9.5−13.5 Gyr.
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