Evolution of accretor stars in massive binaries: broader implications from modeling {\zeta} Ophiuchi

Understand

Most massive stars are born in binaries close enough for mass transfer episodes.

• These modify the appearance, structure, and future evolution of both stars.
• We compute the evolution of a 100-day period binary consisting initially of a 25 M star and a 17 M star, which experiences stable mass transfer.
• We focus on the impact of mass accretion on the surface composition, internal rotation, and structure of the accretor.