Abstract

Contributed Talk - Splinter CloseBinaries   (MW-0250)

Chemical fingerprints of binary interaction in massive stars

Harim Jin
Max Planck Institute for Astrophysics

A substantial fraction of massive stars are expected to be products of binary interaction. Identifying these stars is crucial for assessing the intrinsic binary fraction and for understanding the properties and evolutionary state of individual stars. Using a comprehensive grid of detailed binary evolution models that incorporate an extended nuclear network for hydrogen burning, we have developed a novel diagnostic method to distinguish mergers and mass gainers from self-polluted single stars through their surface chemical abundance patterns. We apply our method to well-studied individual OB stars and validate it using other post-interaction indicators. We expect that this method will provide valuable constraints on highly uncertain merger processes as well as stable msss transfer process.