来自超级爱丁顿恒星的连续流驱动风。两个极限的故事
Continuum driven winds from super-Eddington stars. A tale of two limits
摘要：
连续谱驱动是驱动强星风的有效方法。它受两个极限控制：爱丁顿极限和光子疲劳极限。一颗恒星必须超过有效爱丁顿极限才能连续驱动以克服恒星引力。考虑到恒星辐射场中可用的能量，光子疲劳极限对质量损失率设定了上限，该上限可以被驱动到无穷大。由于连续介质驱动不需要恒星大气中存在金属，因此它特别适合于从低金属丰度和零金属丰度的恒星中移除质量，并在它们的演化中发挥关键作用。使用孔隙度长度形式主义，我们计算数值模拟的超级爱丁顿，连续驱动的风，探索其行为的恒星低于和高于光子疲劳极限。我们发现，在光子疲劳极限以下，连续介质驱动可以产生一个大的，稳定的质量损失率在逃逸速度的数量级的速度。如果恒星超过光子极限，稳定的解决方案就不再可能。而有效质量损失率仍然很大，风速小得多
英文摘要：
Continuum driving is an effective method to drive a strong stellar wind. It is governed by two limits: the Eddington limit and the photon-tiring limit. A star must exceed the effective Eddington limit for continuum driving to overcome the stellar gravity. The photon-tiring limit places an upper limit on the mass loss rate that can be driven to infinity, given the energy available in the radiation field of the star. Since continuum driving does not require the presence of metals in the stellar atmosphere it is particularly suited to removing mass from low- and zero-metallicity stars and can play a crucial part in their evolution. Using a porosity length formalism we compute numerical simulations of super-Eddington, continuum driven winds to explore their behaviour for stars both below and above the photon-tiring limit. We find that below the photon tiring limit, continuum driving can produce a large, steady mass loss rate at velocities on the order of the escape velocity. If the star exceeds the photon-tiring limit, a steady solution is no longer possible. While the effective mass loss rate is still very large, the wind velocity is much smaller
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