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On the origin of the hypervelocity runaway star HD 271791

Published online by Cambridge University Press:  18 January 2010

V. V. Gvaramadze
V. V. Gvaramadze*
Affiliation:
Sternberg Astronomical Institute, Moscow State University, Universitetskij Pr. 13, Moscow 119992, Russia email: [email protected]
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Abstract

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We discuss the origin of the early-B-type runaway star HD 271791 and show that its extremely high velocity (≃530 − 920km s−1) cannot be explained within the framework of the binary–supernova ejection scenario. Instead, we suggest that HD 271791 attained its peculiar velocity in the course of a strong dynamical encounter between two hard, massive binaries or through 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.

Keywords

binaries: closestars: individual (HD 271791)stars: kinematicsgalaxies: star clusters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S266: Star clusters: basic galactic building blocks throughout time and space , August 2009 , pp. 272 - 277
Copyright
Copyright © International Astronomical Union 2010

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