A consistent solution for the velocity field and mass-loss rate of massive stars
A consistent solution for the velocity field and mass-loss rate of massive stars
复制标题
大质量恒星速度场和质量损失率的一致解
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
J. Vink
中科院分区：
文献类型：
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作者：
P. Muller;J. Vink
恒星风是我们理解大质量恒星演化及其进入星际介质的重要方面。在这里，我们提出的解决方案的速度场和质量损失率的恒星流出，以及通过使用所谓的兰伯特W-功能的情况下，质量吸积。对于辐射驱动的风的情况下，速度场的分析得到的线加速度，只依赖于半径，我们从蒙特卡洛多线辐射传输计算得到的参数化描述。在我们的运动方程中，临界点是音速点.我们还推导出一个近似的解析解的超音速流，它非常类似于我们的精确解。对于质量损失率和速度场的同时求解，我们提出了一种新的迭代方法。我们应用我们的理论表达式和我们的迭代方法从一个典型的O 5-V主序星星星的星风，并找到很好的协议与经验值。我们的计算代表了一个自洽的质量损失计算，包括一个O型星星的多线散射的影响，开辟了应用蒙特卡罗质量损失计算的可能性，在宇宙的经验约束不能很容易地获得的地区。
Stellar winds are an important aspect of our understanding of the evolution of massive stars and their input into the interstellar medium. Here we present solutions for the velocity field and mass-loss rates for stellar outflows as well as for the case of mass accretion through the use of the so-called Lambert W-function. For the case of a radiation-driven wind, the velocity field is obtained analytically using a parameterised description for the line acceleration that only depends on radius, which we obtain from MonteCarlo multi-line radiative transfer calculations. In our form of the equation of motion the critical point is the sonic point. We also derive an approximate analytical solution for the supersonic flow which closely resembles our exact solution. For the simultaneous solution of the mass-loss rate and velocity field, we describe a new iterative method. We apply our theoretical expressions and our iterative method to the stellar wind from a typical O5-V main sequence star, and find good agreement with empirical values. Our computations represent a self-consistent mass-loss calculation including the effect of multi-line scattering for an O-type star, opening up the possibility of applying Monte Carlo mass-loss calculations in regions of the Universe for which empirical constraints cannot be readily obtained.