J/A+A/652/A82 HH83 outflow spectrally select. structures pm (Movsessian+, 2021)
Proper motions of spectrally selected structures in the HH 83 outflow.
Movsessian T.A., Magakian T.Yu., Moiseev A.V.
<Astron. Astrophys. 652, A82 (2021)>
=2021A&A...652A..82M 2021A&A...652A..82M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, pre-main sequence ; Interstellar medium
Keywords: ISM: jets and outflows - ISM: individual objects: HH 83 -
stars: individual: HH 83 IRS (IRAS 05311-0631) -
stars: pre-main sequence
Abstract:
We continue our program of investigation of the proper motions of
spectrally separated structures in the Herbig-Haro outflows with the
aid of Fabry-Perot scanning interferometry. This work mainly focuses
on the physical nature of various structures in the jets.
The aim of the present study is to measure the proper motions of the
previously discovered kinematically separated structures in the
working surface of the HH 83 collimated outflow.
We used observations from two epochs separated by 15 years, which were
performed on the 6m telescope with Fabry-Perot scanning
interferometer. We obtained images corresponding to different radial
velocities for the two separate epochs, and used them to measure
proper motions.
In the course of our data analysis, we discovered a counter bow-shock
of HH 83 flow with positive radial velocity, which makes this flow a
relatively symmetric bipolar system. The second epoch observations
confirm that the working surface of the flow is split into two
structures with an exceptionally large (250km/s) difference in radial
velocity. The proper motions of these structures are almost equal,
which suggests that they are physically connected. The asymmetry of
the bow shock and the turning of proper motion vectors suggests a
collision between the outflow and a dense cloud. The profile of the
Hα line for the directly invisible infrared source HH 83 IRS,
obtained by integration of the data within the reflection nebula,
suggests it to be of P Cyg type with a broad absorption component
characteristic of the FU Ori-like objects. If this object underwent an
FU Ori type outburst, which created the HH 83 working surfaces, its
eruption took place about 1500 years ago according to the kinematical
age of the outflow.
Description:
The data consist of two reduced data cubes obtained in 2002 and 2017
with a scanning Fabry-Perot interferometer, centered on the Hα
line. More details can be found in the Sec.2 of the paper.
Common properties of the data cubes stored in the 'fits' subdirectory:
* Data are in fits format
* Cube axes are:
(1) spatial coordinate 1
(2) spatial coordinate 2
(3) wavelength (in Angstroems)
* Spatial coordinates correspond to equatorial coordinate system.
* Heliocentric correction to wavelengths is NOT applied
The sizes and spatial sampling of the cubes are not the same because
the observations were performed with two different interferometers and
light-acquisition systems.
Objects:
-------------------------------------------------
RA (2000) DE Designation(s)
-------------------------------------------------
05 33 32.55 -06 29 44.36 HH 83 = Reipurth 17
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 106 2 List of fits files
fits/* . 2 Individual fits datacubes
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 h RAh Right Ascension of center (J2000)
4- 5 I2 min RAm Right Ascension of center (J2000)
7- 11 F5.2 s RAs Right Ascension of center (J2000)
12 A1 --- DE- Declination sign of center (J2000)
13- 14 I2 deg DEd Declination of center (J2000)
16- 17 I2 arcmin DEm Declination of center (J2000)
19- 22 F4.1 arcsec DEs Declination of center (J2000)
24- 26 I3 --- Nx Number of pixels along X-axis
28- 30 I3 --- Ny Number of pixels along Y-axis
32- 33 I2 --- Nz Number of slices
35- 44 A10 "datime" Obs.date Observation date
46- 50 I5 Kibyte size Size of FITS file
52- 65 A14 --- FileName Name of FITS file, in subdirectory fits
67-106 A40 --- Title Title of the FITS file
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Acknowledgements:
Tigran Yu. Magakian, tigmag(at)sci.am
(End) Patricia Vannier [CDS] 23-Jun-2021