Fig. 24.
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Ratio of thermal timescale tKH to the orbital period of the binary Porb inside the shared envelope in the Hertzprung–Russel diagram constructed for four solar-metallicity nonrotating evolutionary tracks from the MIST database (Dotter 2016; Choi et al. 2016). Here, tKH = G(M1 + Menv)2/(2RL), where L is the luminosity of the star.
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