HR diagram showing the evolution of a representative conservative MESA mass transfer model, with initial masses of 1.23 M_⊙ (donor, orange) and 1.07 M_⊙ (accretor, blue), and initial orbital period of 0.95 days. Filled squares mark the observed positions of S1082 Aa and Ab. Circles show the model positions at 4 Gyr, crosses indicate when mass transfer begins, and diamonds mark the positions at 4.87 Gyr after mass transfer has altered both stars’ evolution.