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arXiv 0903.0738astro-ph.SR
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关于高速逃逸星的起源

On the origin of high-velocity runaway stars

V. V. Gvaramadze, A. Gualandris, S. Portegies Zwart

摘要:

我们探讨的假设,一些高速逃逸恒星达到其特殊的速度在交换过程中遇到硬质量双星和一个非常大质量的恒星(无论是一个普通的50-100 Msun的恒星或更大的一个,通过失控合并的普通恒星在一个年轻的大质量星团的核心)。在这个过程中,双星的一个组成部分被引力束缚在非常大的恒星上,而第二个组成部分则被抛出,有时速度很高。我们进行了三体散射实验,发现早期的B型星(大多数中子星的祖先)可以以$\ga$ 200-400 km/s的速度(典型的中子星)喷出,而3-4 Msun星可以达到$\ga$ 300-400 km/s的速度(典型的晕晚期B型星的束缚人口)。我们还发现,喷出的恒星偶尔可以达到超过银河系逃逸速度的速度。

英文摘要:

We explore the hypothesis that some high-velocity runaway stars attain their peculiar velocities in the course of exchange encounters between hard massive binaries and a very massive star (either an ordinary 50-100 Msun star or a more massive one, formed through runaway mergers of ordinary stars in the core of a young massive star cluster). In this process, one of the binary components becomes gravitationally bound to the very massive star, while the second one is ejected, sometimes with a high speed. We performed three-body scattering experiments and found that early B-type stars (the progenitors of the majority of neutron stars) can be ejected with velocities of $\ga$ 200-400 km/s (typical of pulsars), while 3-4 Msun stars can attain velocities of $\ga$ 300-400 km/s (typical of the bound population of halo late B-type stars). We also found that the ejected stars can occasionally attain velocities exceeding the Milky Ways's escape velocity.

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