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arXiv 0912.0695astro-ph.GA
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疏散星团的运动学研究及其起源

A kinematic study of Open Clusters: implications for their origin

D. Vande Putte, T. P. Garnier, Ignacio Ferreras, R. P. Mignani, Mark Cropper

摘要:

银河系的疏散星团提供了一个深入了解恒星形成的星系。Dias等人的疏散星团表。(2002年b)是一个丰富的数据来源,包括运动学信息。这一大样本使得有可能利用基于轨道偏心率和与银河平面的分离的参数对481个疏散星团轨道进行系统分析。这两个参数可以指示起源,并且我们发现它们是相关的。我们还发现它们与金属丰度相关,另一个参数在其他地方建议作为一个标记的起源,这两个参数中的任何一个的高值通常表明金属丰度低([Fe/H]太阳$<-$ 0.2 dex)。分析结果指出,星表中有四个疏散星团是由高速云撞击在星盘上而产生的,它们是:Berkeley 21、32、99和Melott 66,另外四个可能是由于这种起源(NGC 2158、2420、7789、IC 1311)。另外三个可能是由于银河系球状星团对圆盘的撞击,即银河系内部的起源(NGC 6791,1817和7044)。

英文摘要:

The Galactic population of open clusters provides an insight into star formation in the Galaxy. The open cluster catalogue by Dias et al.(2002b) is a rich source of data, including kinematic information. This large sample made it possible to carry out a systematic analysis of 481 open cluster orbits, using parameters based on orbit eccentricity and separation from the Galactic plane. These two parameters may be indicative of origin, and we find them to be correlated. We also find them to be correlated with metallicity, another parameter suggested elsewhere to be a marker for origin in that high values of any of these two parameters generally indicates a low metallicity ([Fe/H] Solar$<-$0.2 dex). The resulting analysis points to four open clusters in the catalogue being of extra-Galactic origin by impact of high velocity cloud on the disk: Berkeley21, 32, 99, and Melotte66, with a possible further four due to this origin (NGC2158, 2420, 7789, IC1311). A further three may be due to Galactic globular cluster impact on the disk i.e of internal Galactic origin (NGC6791, 1817, and 7044).

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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