Abstract
We have computed a series of axisymmetric simulations of a cloudlet travelling away from a photoionizing source to reproduce the emission arising from the compact knots observed in some Planetary Nebulae. The predicted spectra agree approximately with the observed spectra when shown in two-line ratio diagnostic diagrams. The predicted and observed spatial distributions of the emission (with high ionization lines extending more towards the source than lower ionization lines) agree in a qualitative way.
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Riera, A., Raga, A. C., Mellema, G., Esquivel, A., & Velázquez, P. F. (2009). Physical Conditions of the Shocked Regions of Planetary Nebulae. In Astrophysics and Space Science Proceedings (pp. 601–602). Springer Science and Business Media B.V. https://doi.org/10.1007/978-3-642-00576-3_88
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