94 research outputs found
Two epoch spectro-imagery of FS Tau B outflow system
Herbig-Haro (HH) flows exhibit a large variety of morphological and
kinematical structures such as bow shocks, Mach disks, and deflection shocks.
Both proper motion (PM) and radial velocity investigations are essential to
understand the physical nature of such structures. We investigate the
kinematics and PM of spectrally separated structures in the FS~Tau~B HH flow.
Collating these data makes it possible to understand the origin of these
structures and to explain the unusual behavior of the jet. On the other hand,
the study of emission profiles in the associated reflection nebulae allows us
to consider the source of the outflow both from edge-on and pole-on points of
view. We present the observational results obtained with the 6 m telescope at
the Special Astrophysical Observatory of the Russian Academy of Sciences using
the SCORPIO multimode focal reducer with a scanning Fabry-Perot interferometer.
Two epochs of the observations of the FS~Tau~B region in H emission
(2001 and 2012) allowed us to measure the PM of the spectrally separated inner
structures of the jet. In addition to already known emission structures in the
FS~Tau~B system, we discover new features in the extended part of the jet and
in the counter-jet. Moreover, we reveal a new HH knot in the HH~276 independent
outflow system and point out its presumable source. In the terminal working
surface of the jet, structures with different radial velocities have PMs of the
same value. This result can be interpreted as the direct observation of
bow-shock and Mach disk regions. A bar-like structure, located southwest from
the source demonstrates zero PM and can be considered as one more example of
deflection shock. An analysis of H profiles in the reflection nebulae
R1 and R3 indicates the uniqueness of this object, which can be studied in
pole-on and edge-on directions simultaneously.Comment: 8 pages, 11 figure
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