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Nonconservative Mass Transfer in Massive Binaries and the Formation of Wolf-Rayet+O Binaries

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arxiv 1610.04307 v1 pith:FQ62NQKE submitted 2016-10-14 astro-ph.SR

Nonconservative Mass Transfer in Massive Binaries and the Formation of Wolf-Rayet+O Binaries

classification astro-ph.SR
keywords massbinariestransfermodelaccretioncaseefficiencyformation
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The mass transfer efficiency during the evolution of massive binaries is still uncertain. We model the mass transfer processes in a grid of binaries to investigate the formation of Wolf-Rayet+O (WR+O) binaries, taking into account two kinds of non-conservative mass transfer models: Model I with rotation-dependent mass accretion and Model II of half mass accretion. Generally the mass transfer in Model I is more inefficient, with the average efficiency in a range of $\sim0.2-0.7$ and $ \lesssim0.2 $ for Case A and Case B mass transfer, respectively. We present the parameter distributions for the descendant WR+O binaries. By comparing the modeled stellar mass distribution with the observed Galactic WR+O binaries, we find that highly non-conservative mass transfer is required.

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