On the origin of the hypervelocity runaway star HD 271791
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.
- Publication:
-
Star Clusters: Basic Galactic Building Blocks Throughout Time and Space
- Pub Date:
- January 2010
- DOI:
- 10.1017/S1743921309991141
- arXiv:
- arXiv:0909.4928
- Bibcode:
- 2010IAUS..266..272G
- Keywords:
-
- binaries: close;
- stars: individual (HD 271791);
- stars: kinematics;
- galaxies: star clusters;
- Astrophysics - Solar and Stellar Astrophysics;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 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