Simulated binary star systems with one giant-star member. Points are colored by surface gravity of the primary, log g. Left: distribution of initial orbital parameters period, P, and eccentricity, e. Middle: final distribution of period and eccentricity after computing the change in eccentricity from the evolution of the primary star. Right: final distribution of period and eccentricity, with period normalized by P_surface, the period of a hypothetical, point-mass companion whose orbit grazes the surface of the primary star at pericenter.