The Magnetohydrodynamics of Planetary Nebulae: New Paradigm, New Tools

Frank，Adam“行星状星云的磁流体动力学：新范式，新工具“AST-0098442在这个奖项的颁发过程中，目标是促进我们对行星状星云以及中低质量恒星演化后期阶段的理解。新的行星状星云及其前身的高分辨率图像正在导致对星云形成机制的重新评估。新的观测揭示了纯流体动力学理论无法解释的特征。此外，在原行星状星云阶段之前，来自冷巨星的风显然缺乏能量来辐射驱动膨胀的气体壳层。在本奖项所涵盖的期间内，将纳入磁场，以了解在理论框架中纳入磁流体力学后，可以在多大程度上更好地理解观测结果。将为此目的开发一种新的计算机代码，预计该代码将广泛应用于显示出突出的星周星云的其他恒星。

Frank, Adam"The Magnetohydrodynamics of Planetary Nebulae: New Paradigm, New Tools"AST-0098442In the course of this award, the goal is to advance our understanding of planetary nebulae and the late stages of stellar evolution for stars with low and intermediate mass. New high-resolution images of planetary nebulae and their progenitors are leading to a re-evaluation of the mechanism by which the nebulae are shaped. The new observations have revealed features that cannot be explained by pure hydrodynamic theories. In addition, the winds from cool giants which precede the protoplanetary planetary nebula stage apparently lack the energy for radiative driving of the expanding gas shells. During the period covered by this award, magnetic fields will be incorporated to see to what extent the observations can be understood better with the inclusion of magnetohydrodynamics in the theoretical framework. A new computer code will be developed for this purpose that is expected to have wide application to other stars which display prominent circumstellar nebulae.***