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On the origin of the hypervelocity runaway star HD271791

We discuss the origin of the runaway early B-type star HD271791 and show that its extremely high velocity (\simeq 530-920 km/s) cannot be explained within the framework of the binary-supernova ejection scenario. Instead, we suggest that HD271791 attained its peculiar velocity in the course of a strong dynamical encounter between two hard massive binaries or via an exchange encounter between a hard massive binary and a very massive star, formed through runaway mergers of ordinary massive stars in the dense core of a young massive star cluster.

preprint2009arXivOpen access
V. V. Gvaramadze
astro-ph.GAastro-ph.SR
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V. V. Gvaramadze

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