Abstract

Contributed Talk - Plenary

Mass Transfer Signatures in B-type Binaries: Insights from BBC and OGLE

Willems, Henry
MPIA

Most massive stars are in binary or multiple systems. Binary interaction, often through mass transfer, can alter their evolution, making it important to identify systems that have undergone such processes. The B-type Binaries Characterization Programme (BBC) is a multi-epoch spectroscopic study of 88 early B-type binary candidates in the star-forming region of 30 Doradus, yielding orbital solutions for 84 systems. Combined with OGLE photometry and PHOEBE modelling, key parameters like temperatures, radii, and inclinations are constrained, allowing HR diagram placement and comparison with isochrones. Of 14 systems analyzed in detail, six show signs of mass transfer by deviating from a common isochrone. This work focused on identifying and characterizing the products of binary interaction, particularly those influenced by mass transfer. It highlights that, to obtain tight constraints on stellar parameters and reliably trace their evolutionary paths, it is essential to combine both spectroscopic and photometric observations.