Populations of evolved massive binary stars in the Small Magellanic Cloud II: Predictions from rapid binary evolution

Abstract

Massive star evolution plays a crucial role in astrophysics but bares large uncertainties. This problem becomes more severe by the majority of massive stars being born in close binary systems, whose evolution is affected by the interaction of their components. We want to constrain major uncertainties in massive binary star evolution, in particular the efficiency and the stability of the first mass transfer phase. We use the rapid population synthesis code ComBinE to generate synthetic populations of post-interaction binaries, assuming constant mass-transfer efficiency. We employ a new merger criterion that adjusts self-consistently to any prescribed mass-transfer efficiency. We tailor our synthetic populations to be comparable to the expected binary populations in the Small Magellanic Cloud (SMC). We find that the observed populations of evolved massive binaries can not be reproduced with a single mass-transfer efficiency. Instead, a rather high efficiency (>50%) is needed to reproduce the number of Be stars and Be/X-ray binaries in the SMC, while a low efficiency (~10%) leads to a better agreement with the observed number of Wolf-Rayet stars. We construct a corresponding mass-dependent mass-transfer efficiency recipe to produce our fiducial synthetic SMC post-interaction binary population. It reproduces the observed number and properties of the Be/X-ray and WR-binaries rather well, and is not in stark disagreement with the observed OBe star population. It further predicts two large, yet unobserved populations of OB+BH binaries, that is ~100 OB+BH systems with rather small orbital periods (<20 days) and ~40 longer period OBe+BH systems.

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