Shock excitation of the knots of Hen 3-1475

Details Shock excitation of the knots of Hen 3-1475 Shock excitation of the knots of Hen 3-1475

2006-05-10

arxiv.org/abs/astro-ph/0605257v1

Astronomy and Astrophysics

Astrophysics

13 pages. A&A (in press)

Scientific paper

10.1051/0004-6361:20053499

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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