Volume 455, Number 1, August III 2006
|Page(s)||203 - 213|
|Section||Interstellar and circumstellar matter|
|Published online||31 July 2006|
Shock excitation of the knots of Hen 3-1475
Departament de Física i Enginyeria Nuclear, Universitat Politecnica de Catalunya, Av. Víctor Balaguer s/n, 08800 Vilanova i la Geltrú, Spain e-mail: email@example.com
2 Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Av. Diagonal 647, 08028 Barcelona, Spain
3 Instituto de Astronomía, UNAM, A. Postal 70-264, 04510 México, México e-mail: firstname.lastname@example.org
4 Instituto de Ciencias Nucleares, UNAM, A. Postal 70-543, 04510 México, México e-mail: email@example.com
Accepted: 2 May 2006
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.
Key words: ISM: jets and outflows / ISM: planetary nebulae: individual: Hen 3-1475
© ESO, 2006
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