On the origin of the hypervelocity runaway star HD271791

Abstract

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.

6 pages, 1 figure, to appear in Star Clusters - Basic Galactic Building Blocks throughout Time and Space, Proceed. of the IAU Symp. 266, eds. R. de Grijs and J. Lepine

References in corpus (8)

• Interaction of massive black hole binaries with their stellar environment: I. Ejection of hypervelocity stars
• On the origin of high-velocity runaway stars
• An Alternative Origin for Hypervelocity Stars
• Tracing intermediate-mass black holes in the Galactic Centre
• Runaway Stars, Hypervelocity Stars, and Radial Velocity Surveys
• Hyperfast pulsars as the remnants of massive stars ejected from young star clusters
• HD271791: dynamical versus binary-supernova ejection scenario
• Ejection of Hyper-Velocity Stars from the Galactic Centre by Intermediate-Mass Black Holes