Publications
of the
MPIfR
Optical & Infrared
Interferometry Group
G. Weigelt, Y. Balega, T. Preibisch, D.
Schertl, and M.D. Smith:
Bispectrum speckle interferometry of the
massive protostellar object S140 IRS 1: evidence for multiple outflows
Astronomy & Astrophysics 381, 905-913
(2002)
Abstract.
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 wind-driven outflow.
We discuss the implications for the nature of the central source.
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