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Title:
On the origin of the hypervelocity runaway star HD 271791
Authors:
Gvaramadze, V. V.
Affiliation:
AA(Sternberg Astronomical Institute, Moscow State University, Universitetskij Pr. 13, Moscow 119992, Russia )
Publication:
Star clusters: basic galactic building blocks throughout time and space, Proceedings of the International Astronomical Union, IAU Symposium, Volume 266, p. 272-277
Publication Date:
01/2010
Origin:
CUP
Keywords:
binaries: close, stars: individual (HD 271791), stars: kinematics, galaxies: star clusters
DOI:
10.1017/S1743921309991141
Bibliographic Code:
2010IAUS..266..272G

Abstract

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.

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