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
复制标题
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
中科院分区:
文献类型:
--
作者:
Zhai Meng;Abt Helmut;Zhao Gang;Li Chengdong
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.
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影响因子:
6.5
作者:
E. Bica;C. Dutra;B. Sul;Brazil.;U. S. Paulo
通讯作者:
E. Bica;C. Dutra;B. Sul;Brazil.;U. S. Paulo
DOI:
10.1086/118126
发表时间:
1996-10
期刊:
The Astronomical Journal
影响因子:
--
作者:
O. Eggen
通讯作者:
O. Eggen
DOI:
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1993
期刊:
--
影响因子:
--
作者:
J. Mermilliod
通讯作者:
J. Mermilliod
DOI:
10.1086/146435
发表时间:
1958
期刊:
The Astrophysical Journal
影响因子:
--
作者:
L. Spitzer
通讯作者:
L. Spitzer
DOI:
10.1086/115159
发表时间:
1989-08
期刊:
The Astronomical Journal
影响因子:
--
作者:
E. Kontizas;M. Kontizas;G. Sedmak;R. Smareglia
通讯作者:
E. Kontizas;M. Kontizas;G. Sedmak;R. Smareglia