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The high-velocity outflow in the proto-planetary nebula Hen 3-1475 | | A. Riera
; P. Garcia-Lario
; A. Manchado
; M. Bobrowsky
; R. Estalella
; | | Date: |
5 Mar 2003 | | Journal: | Astron.Astrophys. 401 (2003) 1039-1056 | | Subject: | astro-ph | | Abstract: | The proto-planetary nebula Hen 3-1475 shows a remarkable highly collimated optical jet with an S-shaped string of three pairs of knots and extremely high velocities. We present here a detailed analysis of the overall morphology, kinematic structure and the excitation conditions of these knots based on deep ground-based high dispersion spectroscopy complemented with high spatial resolution spectroscopy obtained with STIS onboard HST, and WFPC2 [N II] images. The spectra obtained show double-peaked, extremely wide emission line profiles, and a decrease of the radial velocities with distance to the source in a step-like fashion. We find that the emission line ratios observed in the intermediate knots are consistent with a spectrum arising from the recombination region of a shock wave with shock velocities ranging from 100 to 150 km/s. We propose that the ejection velocity is varying as a function of time with a quasi-periodic variability (with timescale of the order of 100 years) and the direction of ejection is also varying with a precession period of the order of 1500 years. | | Source: | arXiv, astro-ph/0303111 | | Services: | Forum | Review | PDF | Favorites | |
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