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arXiv 1802.04560astro-ph.GAastro-ph.SR
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作为大质量恒星形成示踪物的大质量宽双星

Massive, wide binaries as tracers of massive star formation

Daniel W. Griffiths, Simon P. Goodwin, Saida M. Caballero-Nieves

摘要:

大质量恒星可以和其他大质量恒星一起在宽的(几百到几千个天文单位)双星中找到。我们使用$N$体模拟表明,任何绑定集群应该总是有大约一个大规模的宽的二进制:一个可能会形成,如果没有最初的存在,可能只有一个将生存,如果一个以上的存在最初。因此,任何包含许多大质量宽双星的区域都必须由许多单独的子区域组成。对天鹅座OB 2的观测显示,大质量宽双星的比例至少是一半(38/74),这表明天鹅座OB 2至少有30个不同的大质量恒星形成点。这进一步证明天鹅座OB 2一直是一个大的,低密度的协会。天鹅座OB 2的总质量有一个正常的高质量IMF,这表明无论大质量恒星如何形成,它们都会“随机抽样”IMF(因为大质量恒星并不“知道”彼此)。

英文摘要:

Massive stars can be found in wide (hundreds to thousands AU) binaries with other massive stars. We use $N$-body simulations to show that any bound cluster should always have approximately one massive wide binary: one will probably form if none are present initially; and probably only one will survive if more than one are present initially. Therefore any region that contains many massive wide binaries must have been composed of many individual subregions. Observations of Cyg OB2 show that the massive wide binary fraction is at least a half (38/74) which suggests that Cyg OB2 had at least 30 distinct massive star formation sites. This is further evidence that Cyg OB2 has always been a large, low-density association. That Cyg OB2 has a normal high-mass IMF for its total mass suggests that however massive stars form they 'randomly sample' the IMF (as the massive stars did not 'know' about each other).

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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