Ellipticities at R(h) of LMC star clusters
Ellipticities at R(h) of LMC star clusters
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DOI：
10.1086/115159
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发表时间：
1989-08
期刊：
影响因子：
--
通讯作者：
E. Kontizas;M. Kontizas;G. Sedmak;R. Smareglia
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文献类型：
--
作者：
E. Kontizas;M. Kontizas;G. Sedmak;R. Smareglia
在Apollo 570工作站上，用PDS 1010 A扫描和计算机交互约化方法，计算了53个大麦哲伦星系星星团的投影椭圆率。使用的是由1.2米英国施密特望远镜在澳大利亚拍摄的一对J和U底片的胶片拷贝。这里得出的椭圆度同意与以前的调查人员发现，当比较是可能的，在相同的半径。球状星团内部的椭圆度变化是一种普遍现象，因此我们采用距离中心半质量半径R（h）处的椭圆度e（h）来表示星团的平坦度。使用这些值的LMC集群，它被发现，LMC集群更椭圆比银河系。虽然年轻的LMC球状星团比年老的球状星团更倾向于椭圆形，但没有强有力的证据表明它们之间存在显著差异。最后，发现e（h）随着星系团的总质量而增加，这可能表明高质量星系团比低质量星系团具有更高的角动量，或者更难脱落角动量，并且保持其初始扁平形状的时间更长。更多»参考文献18。«少
The projected ellipticities of 53 populous LMC star clusters have been derived by means of PDS 1010A scans and a computer interactive method of reduction implemented on an Apollo 570 workstation. Film copies of a pair of J and U plates taken with the 1.2 m UK Schmidt Telescope in Australia were used. The ellipticities derived here agree with those found by previous investigators, when comparisons were possible at the same radius. Ellipticity variations within individual globular clusters are seen to be a common phenomenon, so the ellipticities e(h) at a distance corresponding to the half-mass radius R(h) from the center were adopted to represent the cluster's flatness. Using these values for the LMC clusters, it is found that LMC clusters are more elliptical than those of the Galaxy. Although the young LMC globular clusters show a tendency to be more elliptical than the old ones, there is no strong evidence for a significant difference among them. Finally, e(h) was found to increase with the total mass of the clusters, possibly indicating that high-mass clusters have higher angular momentum, or have more difficulty in shedding angular momentum, than do low mass clusters, and remain longer in their initial flattened shape.more » 18 refs.« less