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arXiv 0909.1225astro-ph.GA
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甚宽双星的形成

The formation of very wide binaries

M. B. N. Kouwenhoven, S. P. Goodwin, Richard J. Parker, M. B. Davies, D. Malmberg, P. Kroupa

摘要:

在过去的几十年里,在银河系的场和晕中发现了许多宽(>1000 AU)的双星。这些宽双星的起源不能用恒星形成或银河系场的动力学相互作用来解释。我们解释它们的存在广泛的二元形成过程中的年轻星团的溶解阶段。在这种情况下,两颗单星在同一时间,以相同的方向,以相似的速度离开溶解的星团,形成一个新的,非常宽的双星。使用N-体模拟,我们研究如何频繁地发生这种情况,以及如何的轨道参数,这样的二进制依赖于集群的属性,它们来自。根据初始条件,单个星团的宽双星比例为1- 30%。由于大多数恒星形成的一部分,一个二进制或多个系统,我们预测,大部分这些宽的二进制实际上是广泛的三重和四重系统。

英文摘要:

Over the last decades, numerous wide (>1000 AU) binaries have been discovered in the Galactic field and halo. The origin of these wide binaries cannot be explained by star formation or by dynamical interactions in the Galactic field. We explain their existence by wide binary formation during the dissolution phase of young star clusters. In this scenario, two single stars that leave the dissolving cluster at the same time, in the same direction, and with similar velocities, form a new, very wide binary. Using N-body simulations we study how frequently this occurs, and how the orbital parameters of such binaries depend on the properties of the cluster from which they originate. The resulting wide binary fraction for individual star clusters is 1-30%, depending on the initial conditions. As most stars form as part of a binary or multiple system, we predict that a large fraction of these wide binaries are in fact wide triple and quadruple systems.

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