The structure of Planetary Nebulae: theory vs. practice

Details The structure of Planetary Nebulae: theory vs. practice The structure of Planetary Nebulae: theory vs. practice

2006-01-13

arxiv.org/abs/astro-ph/0601283v1

Astronomy and Astrophysics

Astrophysics

18 pages, 7 figures, A&A accepted

Scientific paper

10.1051/0004-6361:20054554

This paper - the first of a short series dedicated to the long-stan ding astronomical problem of de-projecting the bi-dimensional apparent morpholog y of a three-dimensional mass of gas - focuses on the density distribution in real Planetary Nebulae (and all types of expanding nebulae). We introduce some basic theoretical notions, discuss the observational methodology and develope the accurate procedure for the determination of the matter radial profile within the sharp portion of nebula in the plane of the sky identified by the zero-velocity-pixel-column (zvpc) of high-resolution spectral images. Moreover, a series of evolutive snapshots is presented, combining illustrative examples of model- and true-Planetary Nebulae. Last, the general and specific applications of the method (and some caveats) are discussed.

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