Query : 2003A&A...401.1039R

2003A&A...401.1039R - Astronomy and Astrophysics, volume 401, 1039-1056 (2003/4-3)

The high-velocity outflow in the proto-planetary nebula Hen 3-1475.


Abstract (from CDS):

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 150km/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. Some slowing down with distance along the axis of the Hen 3-1475 jet may be due to the entrainment process and/or to the enviromental drag. This scenario is supported by geometric and kinematic evidence: firstly, the decrease of the radial velocities along the Hen 3-1475 jet in a step like fashion; secondly, the kinematic structure observed in the knots; thirdly, the point-symmetric morphology together with the high proper motions shown by several knots; and finally the fact that the shock velocity predicted from the observed spectra of the shocked knots is much slower than the velocities at which these knots move outwards with respect to the central source.

Abstract Copyright:

Journal keyword(s): ISM: jets and outflows - planetary nebulae: kinematics - planetary nebulae: individual: Hen 3-1475

Nomenclature: Fig.1, Table 1: [BBH97] WWWNa (Nos NW1a to NW1c) added.

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 CD-59 6479 Be* 17 16 21.08 -59 29 23.3 10.03 10.73 10.75     B3e 126 0
2 Hen 3-1475 PN 17 45 14.1819342984 -17 56 46.778166204       12.733   B7e 194 0
3 HH 80A HH 18 19 06.09 -20 51 50.4           ~ 9 0
4 HH 81A HH 18 19 06.62 -20 51 06.5           ~ 8 0
5 HH 32 HH 19 20 30 +11 02.0           ~ 108 1
6 HH 32D HH 19 20 31.29 +11 01 50.5           ~ 14 0
7 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 725 2

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