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Shock excitation of the knots of Hen 3-1475

A. Riera·L. Binette·A. C. Raga
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Abstract

We present new optical STIS HST spectroscopic observations of the jets of the proto-planetary nebula Hen 3-1475. The excitation conditions of the knots of Hen 3-1475 are derived from the observed optical spectra, confirming that the knots are shock excited. The shocked spectra are qualitatively reproduced by simple ``3/2''D bow shock models. We present a set of bow shock models devoted to planetary nebulae, and discuss the effects of the pre-ionization conditions, the bow shock velocity, the bow shock shape and the chemical abundances on the predicted spectra. To explore the reliability of the ``3/2''D bow shock models, we also compare the observed spectra of other three proto-planetary nebulae (M 1-92, M 2-56 and CRL 618) to the predicted spectra.

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A. Riera, L. Binette, A. C. Raga. 2006-05-10. Shock excitation of the knots of Hen 3-1475. https://doi.org/10.1051/0004-6361%3A20053499

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