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arXiv 1111.3644astro-ph.GA
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OB逃逸星的起源

The Origin of OB Runaway Stars

Michiko Fujii, Simon Portegies Zwart

摘要:

银河系中大约20%的大质量恒星具有异常高的速度,其起源困扰了天文学家半个世纪。我们认为,这些速度起源于强大的引力相互作用之间的单星和双星在星团的中心。喷射双星在年轻星团($\aplt 1$ \,Myr)坍缩时自然形成。该模型复制了银河系OB逃逸的关键特征,并解释了年轻星团(如R136和Westerlund~2)周围的$\apgt 100$ \、\Msun \逃逸恒星。如果大多数大质量恒星诞生在致密的、相对低质量的(5000-10000 \Msun)星团中,那么银河系中逃逸星的高比例及其质量和速度分布就可以重现。

英文摘要:

About 20% of all massive stars in the Milky Way have unusually high velocities, the origin of which has puzzled astronomers for half a century. We argue that these velocities originate from strong gravitational interactions between single stars and binaries in the centers of star clusters. The ejecting binary forms naturally during the collapse of a young ($\aplt 1$\,Myr) star cluster. This model replicates the key characteristics of OB runaways in our galaxy and it explains the $\apgt 100$\,\Msun\, runaway stars around young star clusters, e.g. R136 and Westerlund~2. The high proportion and the distributions in mass and velocity of runaways in the Milky Way is reproduced if the majority of massive stars are born in dense and relatively low-mass (5000-10000 \Msun) clusters.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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