| Issue |
A&A
Volume 390, Number 1, July IV 2002
|
|
|---|---|---|
| Page(s) | L5 - L9 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:20020890 | |
| Published online | 05 July 2002 | |
Letter to the Editor
A twisted jet from R Mon*
1
Byurakan Astrophysical Observatory, Aragatsotn prov., 378433 Armenia and Isaac Newton Institute of Chile, Armenian Branch e-mail: tigmag@sci.am
2
Special Astrophysical Observatory, N.Arkhyz, Karachaevo-Cherkesia, 369167, Russia e-mail: vafan@sao.ru
Corresponding author: T. A. Movsessian, tigmov@bao.sci.am
Received:
2
April
2002
Accepted:
11
June
2002
We present the results of long-slit and integral-field spectroscopy
of the R Mon Herbig-Haro jet. The data were obtained with the 6 m telescope.
A slightly curved jet of 16´´ in length is evident in [
] lines. Maps of radial velocities and electron densities are shown. The difference between radial velocities on the sides of the jet as well as the density distribution can be considered as an indication of presence of the helical shock structure in the jet. This structure, having a DNA-like appearance, abruptly changes direction near the edges, which could account for the observed velocity variations. Radial velocities were determined also for the several knots in the HH 39 group.
The kinematics of the system as a whole also suggests the precession of
the outflow.
Key words: ISM: individual objects: R Mon / jets and outflows / kinematics and dynamics
© ESO, 2002
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