A Grand Challenge for Planetary Nebulae
A Grand Challenge for Planetary Nebulae
复制标题
行星状星云的巨大挑战
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
B. Balick
中科院分区：
文献类型：
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作者：
A. Frank;O. Marco;E. Blackman;B. Balick
PN的研究一直面临着越来越多的困境，尚未找到一致的解决方案。这些问题既是观察性的，也是理论性的，可以说是一系列“事实”，目前还不能通过一个单一的框架来解释。我们回顾了这些事实，并提出了一个骨架框架，以发展一个新的理解后AGB星，PPN和PN。我们的框架代表了一种尝试，阐明了恒星演化的后期阶段，可以同时包含中央引擎的性质和它们产生的外流的全球视角。我们的框架侧重于相互作用的双星中心驱动准直外流通过MHD过程。我们建议，该领域的AGB/PN研究现在面临着一个“巨大的挑战”，在阐明这些对象的观测系统的方式，可以解决相关的问题，二进制和磁成形。一个理论上的大挑战也面临着综合研究的形式，可以解释的高度非线性过程与相互作用的二进制驱动的MHD流出。这些问题包括通过发电机过程产生的磁场，吸积盘的创建，共同包络喷射的动力学和磁化射流的创建。
The study of PN has been confronting a growing list of dilemmas which have yet to find coherent resolution. These issues are both observational and theoretical and can be stated as a series of "facts" which can not, as of yet, be accounted for via a single framework. We review these facts and propose a skeleton framework for developing a new understanding post-AGB stars, PPN and PN. Our framework represents an attempt to articulate a a global perspective on the late stages of stellar evolution that can embrace both the nature of the central engine and the outflows they produce. Our framework focuses on interacting binary central stars which drive collimated outflows through MHD processes. We propose that the field of AGB/PN studies now faces a "Grand Challenge" in articulating the observational systematics of these objects in a way that can address issues related to binarity and magnetic shaping. A theoretical Grand Challenge is also faced in the form of integrated studies which can explicate the highly non-linear processes associated with MHD outflows driven by interacting binaries. These issues include the generation of magnetic fields via dynamo processes, the creation of accretion disks, the dynamics of Common Envelope ejection and the creation of magnetized jets.