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arXiv 0904.4017astro-ph.GA
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双星还是双星：关于疏散星团的多重性

Double or binary: on the multiplicity of open star clusters

R. de la Fuente Marcos, C. de la Fuente Marcos

备注：
6 pages, 3 figures; accepted by Astronomy and Astrophysics Letters
发表信息：
Astronomy and Astrophysics Letters, Volume 500, Issue 2, 2009, pages L13-L16
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摘要：

观测表明，麦哲伦星云中潜在的双星团的比例约为10%。相比之下，人们普遍认为星系盘中的双星团频率要低得多。在这里，我们调查了银河系盘中星团的多样性，以证实或反驳这种双星的缺乏。我们量化的疏散星团的多样性使用完整的，体积有限的样品从WEBDA和NCOVOCC。在太阳圈，至少有12%的疏散星团似乎正在经历与另一个星团的某种相互作用;即，可能是二进制的。和麦哲伦星云一样，粒子对分离直方图暗示了双峰分布。近40%的已识别对可能是原始的。剩下的大多数对可能正在经历某种类型的近距离接触，也许是轨道共振的结果。与早期的理论预测一致，盘中束缚对的破坏的特征时间尺度是2亿年或一个银河系轨道。我们的结果表明，在银河系盘中的可能的双星系团的比例是可比的麦哲伦云。

英文摘要：

Observations indicate that the fraction of potential binary star clusters in the Magellanic Clouds is about 10%. In contrast, it is widely accepted that the binary cluster frequency in the Galaxy disk is much lower. Here we investigate the multiplicity of clusters in the Milky Way disk to either confirm or disprove this dearth of binaries. We quantify the open cluster multiplicity using complete, volume-limited samples from WEBDA and NCOVOCC. At the Solar Circle, at least 12% of all open clusters appear to be experiencing some type of interaction with another cluster; i.e., are possible binaries. As in the Magellanic Clouds, the pair separation histogram hints of a bimodal distribution. Nearly 40% of identified pairs are probably primordial. Most of the remaining pairs could be undergoing some type of close encounter, perhaps as a result of orbital resonances. Confirming early theoretical predictions, the characteristic time scale for destruction of bound pairs in the disk is 200 Myr or one galactic orbit. Our results show that the fraction of possible binary clusters in the Galactic disk is comparable to that in the Magellanic Clouds.

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