捕捉一个成年海星行星状星云：一。PC 22的形态运动学研究
Catching a Grown-Up Starfish Planetary Nebula: I. Morpho-Kinematical study of PC 22
摘要：
我们提出的行星状星云（PN）PC 22，重点是使用深成像和高分辨率阶梯光谱进行详细的形态运动学分析的调查的第一部分。PC 22被发现是一个多极PN发射主要在[O III]和显示多个非对称流出。它的中心区域也被发现是特别不均匀的一系列低电离结构（结）位于流出的路径上。用SHAPE获得的形态运动学模型表明：i）流出物的反投影速度相当大，> 100 km/s，而中心区域在“威尔逊效应”之后具有~25至~45 km/s范围内的膨胀速度，ii）大多数测量结构具有相似的倾角，~100度，即它们是共面的，和iii）所有流出和叶是同时代的（在不确定性内）。所有这些结果使我们认为PC 22是一种进化的海星PN。我们建议，负责PC 22的形态的机制包括风壳相互作用，其中快速后AGB风流过一个有一些大的空隙的AGB壳。
英文摘要：
We present the first part of an investigation on the planetary nebula (PN) PC 22 which focuses on the use of deep imaging and high resolution echelle spectroscopy to perform a detailed morpho-kinematical analysis. PC 22 is revealed to be a multipolar PN emitting predominantly in [O III] and displaying multiple non-symmetric outflows. Its central region is found to be also particularly inhomogeneous with a series of low ionization structures (knots) located on the path of the outflows. The morpho-kinematical model obtained with SHAPE indicates that i) the de-projected velocities of the outflows are rather large, > 100 km/s, while the central region has expansion velocities in the range ~25 to ~45 km/s following the "Wilson effect", ii) the majority of the measured structures share similar inclination, ~100 degrees, i.e. they are coplanar, and iii) all outflows and lobes are coeval (within the uncertainties). All these results make us to suggest that PC 22 is an evolved starfish PN. We propose that the mechanism responsible for the morphology of PC 22 consists of a wind-shell interaction, where the fast post-AGB wind flows through a filamentary AGB shell with some large voids.
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