Evolution of mass loss rate (top row), stellar mass (second row), surface chemical composition (third row) and rotational velocity ω/ω_crit (bottom row) as a function of age for binary models I (left), II (middle) and III (right). Orange and blue lines correspond to the primary and secondary stars, respectively. For the surface chemical composition, the helium mass fraction (blue solid lines) and nitrogen mass fraction (blue dashed lines) are shown for the secondary star.