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arXiv 0910.5796astro-ph.GA
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甚宽双星系统的起源

The origin of very wide binary systems

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

摘要:

银河系中的大多数恒星都是双星或多星系统的一部分。这些系统中有相当一部分的轨道间隔超过数千个天文单位,并且在星系晕中发现了比秒差距更宽的系统。这些双星系统不可能通过“正常”的恒星形成过程形成,也不可能通过银河系的捕获过程形成。我们认为,这些广泛的系统形成于年轻星团的溶解阶段。我们测试这一假设,使用N体模拟不断发展的星团,并发现广泛的二进制分数为1- 30%,这取决于初始条件。此外,考虑到大多数恒星形成为双星系统的一部分,我们的理论预测,大部分已知的宽“双星”实际上是多系统。

英文摘要:

The majority of stars in the Galactic field and halo are part of binary or multiple systems. A significant fraction of these systems have orbital separations in excess of thousands of astronomical units, and systems wider than a parsec have been identified in the Galactic halo. These binary systems cannot have formed through the 'normal' star-formation process, nor by capture processes in the Galactic field. We propose that these wide systems were formed during the dissolution phase of young star clusters. We test this hypothesis using N-body simulations of evolving star clusters and find wide binary fractions of 1-30%, depending on initial conditions. Moreover, given that most stars form as part of a binary system, our theory predicts that a large fraction of the known wide 'binaries' are, in fact, multiple systems.

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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