Bispectrum speckle interferometry of
the massive protostellar object S140 IRS 1:
evidence for multiple outflows
Gerd Weigelt, Yuri Y. Balega, Thomas Preibisch, Dieter Schertl,
Michael D. Smith
Astronomy & Astrophysics, 381, 905 (2002)
Bispectrum speckle interferometry is employed to explore
the immediate environment of the deeply embedded young stellar object
S140 IRS 1. A K'-band (2.0 - 2.3 micrometer)
diffraction-limited resolution of
76 mas (~ 70 AU) is achieved with the SAO 6 m telescope,
as well as a dynamical range of more than 8 magnitudes and
a field of view of 13'' x 21''.
Our image exhibits many previously unseen complex structures.
In addition to the bright, elongated, and very clumpy
feature pointing from the central source to the south-east, which was
already discussed in a previous paper (Schertl et al. 2000), we find
several arc-like structures north-east of IRS 1, extended diffuse
emission south of IRS 1, and four new point sources.
The diffuse and fragmentary structures close to IRS 1 appear to
trace circumstellar material swept up by energetic outflows. In
combination with molecular line emission maps from the literature,
our image provides direct confirmation that
two distinct bipolar outflow systems continue to be driven
from IRS 1 on scales between 3'' and 100''.
A system of three arc-like structures to the north-east
is consistent with cavities excavated by a precessing jet or
We discuss the implications for the nature
of the central source.
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