Mass loss from red giants in old open clusters
Mass loss from red giants in old open clusters
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古老疏散星团中红巨星的质量损失
DOI：
10.1093/mnras/173.1.223
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发表时间：
1975
影响因子：
4.8
通讯作者：
T. Hawarden
中科院分区：
文献类型：
--
作者：
T. Hawarden
人们发现，在比毕星团更古老的六个疏散星团样本的所有成员中，巨型分支丛或红色水平分支的恒星在星团中心的集中度低于上部主序带的恒星。在NGC 2158星团中，这种效应非常突出，并且被证明是该星团的真实物理特性。然而，NGC 2477 中类似的明显强烈的影响可能是由于星团中径向位置的红化系统变化的结果。研究的六个旧星团中至少有五个显示出相同意义上的分散现象，这一事实被视为该现象是第一族系统水平分支的普遍属性的证据。有人认为，这种现象是红巨星演化最明亮阶段质量损失的结果，可能是由恒星风机制造成的。
The stars of the giant branch clump or red horizontal branch in all members of a sample of six open clusters older than the Hyades are found to be less concentrated towards the cluster centre than the stars of the upper main sequence. In the cluster NGC 2158 the effect is very prominent and is shown to be a real physical property of the cluster. A similar apparently strong effect in NGC 2477 may, however, be a consequence of a systematic variation of reddening with radial position in the cluster. The fact that at least five of the six old clusters studied show the deconcentration phenomenon in the same sense is taken as evidence that the phenomenon is a general property of the horizontal branches of Population I systems. It is argued that the phenomenon is a consequence of mass loss during the most luminous phases of red giant evolution, probably by a stellar wind mechanism.