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arXiv 0909.4928astro-ph.SRastro-ph.GA
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超高速逃逸星HD271791的起源

On the origin of the hypervelocity runaway star HD271791

V. V. Gvaramadze

摘要:

我们讨论了逃逸的早期B型星HD 271791的起源,并表明它的极高的速度(\simeq 530-920 km/s)不能在双星-超新星抛射的框架内解释。相反,我们认为HD 271791达到其特殊的速度在两个硬质量双星之间的强大动力学遭遇过程中,或通过硬质量双星和一个非常大质量的恒星之间的交换遭遇,通过普通的大质量恒星在年轻的大质量星团的致密核心失控合并形成。

英文摘要:

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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