The Shape Evolution of Galactic Open Clusters from Observations under Galactic External Forces

The Shape Evolution of Galactic Open Clusters from Observations under Galactic External Forces
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银河外力作用下银河系疏散星团的形状演化

DOI:
10.3847/1538-3881/153/2/57
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发表时间:
2017-01
影响因子:
5.3
通讯作者:
Li Chengdong
Li Chengdong
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhai Meng;Abt Helmut;Zhao Gang;Li Chengdong

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我们用恒星统计方法给出了来自WEBDA数据库的154个疏散星系团的银河系特征。我们发现我们样品中的所有团簇都是拉长的形状,这表明球状团簇随着年龄的变化被拉伸成椭球体。通过将星系团分为中心核心部分和外部部分,我们分别计算了这两部分的视椭圆度。椭圆度与年龄的标度关系表明,疏散星团的外围部分变得更椭圆形,而中心核心保持圆形。我们认为,外围部分变得更加椭圆形,因为它们更多地受到外力的影响,例如银河系的差异旋转,而中央核心在恒星动力学的支配下形成圆形。我们还分析了星团质量和位置对其形状的重要影响。
We present the Galactic characteristics of 154 open clusters using the stellar statistics method with data from the WEBDA database. We find that all clusters in our sample are elongated in shape, which indicates that the spherical clusters are stretched out to be ellipsoid as a function of age . By dividing a cluster into a central core and an outer part, we have computed the apparent ellipticities of these two parts respectively. The scale relations between ellipticities and age indicate that the outer parts of open clusters become more elliptical while the central cores remain circular. We suppose that the outer parts become more elliptical because they are more subjected to the external forces, e.g., Galactic differential rotation, while the central cores form a circular shape under the domination of stellar dynamics. We have also performed an analysis of the crucial influence of cluster mass and location on its shape.
DOI: 10.1051/0004-6361:20021479
发表时间: 2002-10
影响因子: 6.5
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