Mass loss from dynamically unstable stellar envelopes
Mass loss from dynamically unstable stellar envelopes
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DOI：
10.1086/155767
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发表时间：
1978
期刊：
影响因子：
--
通讯作者：
Y. Tuchman;N. Sack;Z. Barkat
中科院分区：
文献类型：
--
作者：
Y. Tuchman;N. Sack;Z. Barkat
给出了红巨星包层的动力学稳定性和动力学行为的广泛研究结果。重新分析了亮度（L）-有效温度（T/sub eff/）平面上静态热平衡包络动态不稳定的区域，发现其比迄今为止认为的更复杂。讨论了该区域的结构及其对相关物理参数的依赖性。不稳定的信封的运动是由一个数值流体动力学代码，它被发现，一些少量的质量损失发生通过冲击弹射机制，如以前在文献中所建议的。然而，也发现这种质量损失确实反复发生，因此在进化的时间尺度上预计会有相当大的质量损失。
Results of an extensive study of the dynamical stability and dynamical behavior of envelopes of red giants are given. The region on the luminosity (L) -effective temperature (T/sub eff/) -plane within which static, thermally equilibrated envelopes are dynamically unstable is reanalyzed and is found to be more complex than has hitherto been thought. The significance of the structure of this region and its dependence on relevant physical parameters is discussed. The motion of unstable envelopes is followed by a numerical hydrodynamical code; it is found that some small amount of mass loss occurs via a shock ejection mechanism as previously suggested in the literature. It is, however, also found that this mass loss does occur repeatedly, so that a rather large amount of mass loss is expected over an evolutionary time scale.