原行星状星云CRL 618的非对称喷流发射模型
An asymmetric jet launching model for the protoplanetary nebula CRL 618
摘要：
我们提出了一个不对称的喷流喷射机制，以模拟在一些原行星状星云（pPNe），如pPN CRL 618的波瓣分布中观察到的镜像对称性。对从轨道源发射的旋进喷流进行了三维流体动力学模拟，包括两个流出叶的喷射的交替，取决于哪一侧的旋进吸积盘被来自Roche叶填充双星伴星的吸积柱撞击。从数值结果中得到了合成的光学发射图和位置-速度（PV）图，目的是与观测进行直接比较。取决于观察者的观点，多极形态获得的表现出镜像对称，在大的距离从中央源。获得的瓣大小及其空间分布与观察到的pPN CRL 618的形态学非常一致。我们还得到的手指的运动年龄是类似的观测中获得的。
英文摘要：
We propose an asymmetrical jet ejection mechanism in order to model the mirror symmetry observed in the lobe distribution of some protoplanetary nebulae (pPNe), such as the pPN CRL 618. 3D hydrodynamical simulations of a precessing jet launched from an orbiting source were carried out including an alternation in the ejections of the two outflow lobes, depending on which side of the precessing accretion disk is hit by the accretion column from a Roche lobe-filling binary companion. Both synthetic optical emission maps and position-velocity (PV) diagrams were obtained from the numerical results with the purpose of carrying out a direct comparison with observations. Depending on the observer's point of view, multipolar morphologies are obtained which exhibit a mirror symmetry at large distances from the central source. The obtained lobe sizes and their spatial distribution are in good agreement with the observed morphology of the pPN CRL 618. We also obtain that the kinematic ages of the fingers are similar to those obtained in the observations.
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