The structure of planetary nebulae: theory vs. practice
The structure of planetary nebulae: theory vs. practice
复制标题
行星状星云的结构：理论与实践
DOI：
--
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
S. Benetti
中科院分区：
文献类型：
--
作者：
F. Sabbadin;M. Turatto;R. Ragazzoni;E. Cappellaro;S. Benetti
上下文本文是致力于长期存在的天文学问题的一个简短的系列中的第一个，这个问题是三维气体质量的二维表观形态的去投影。目标。我们专注于真实的行星状星云（以及所有类型的膨胀星云）的密度分布。方法.我们介绍了一些基本的理论概念，讨论了观测方法，并制定了一个准确的程序来确定在天空平面中的星云的尖锐部分的高分辨率光谱图像的零速度像素柱（zvpc）确定的物质径向轮廓。结果一般和具体的应用程序的方法（和一些警告）进行了讨论。此外，我们提出了一系列的演变快照，结合模型和真正的行星状星云的说明性例子。结论. zvpc径向密度重建-添加到层析成像和三维恢复在帕多瓦天文台（意大利）开发-构成了一个非常有用的工具，更密切地关注的空间运动学，物理条件，离子结构和膨胀星云的演变。
Context. This paper is the first in a short series dedicated to the long-standing astronomical problem of de-projecting the bidimensional, apparent morphology of a three-dimensional mass of gas. Aims. We focus on the density distribution in real planetary nebulae (and all types of expanding nebulae). Methods. We introduce some basic theoretical notions, discuss the observational methodology, and develop an accurate procedure for determining the matter radial profile within the sharp portion of nebula in the plane of the sky identified by the zero-velocity-pixelcolumn (zvpc) of high-resolution spectral images. Results. The general and specific applications of the method (and some caveats) are discussed. Moreover, we present a series of evolutive snapshots, combining illustrative examples of both model and true planetary nebulae. Conclusions. The zvpc radial-density reconstruction – added to tomography and 3D recovery developed at the Astronomical Observatory of Padua (Italy) – constitutes a very useful tool for looking more closely at the spatio-kinematics, physical conditions, ionic structure, and evolution of expanding nebulae.