On the origin of the hypervelocity runaway star HD271791

Details On the origin of the hypervelocity runaway star HD271791 On the origin of the hypervelocity runaway star HD271791

2009-09-27

arxiv.org/abs/0909.4928v1

IAU Symp.266:272-277,2010

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

6 pages, 1 figure, to appear in Star Clusters - Basic Galactic Building Blocks throughout Time and Space, Proceed. of the IAU

Scientific paper

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.

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