Publications
of the
MPIfR
Optical & Infrared
Interferometry Group
D. Schertl, Y. Balega, T. Hannemann,
K.-H. Hofmann, T. Preibisch, and G. Weigelt:
Diffraction-limited bispectrum speckle
interferometry and speckle polarimetry of the young bipolar outflow
source S140 IRS1
Astronomy & Astrophysics 361, L29-L32
(2000)
Abstract.
We present bispectrum speckle interferometry and speckle polarimetry of
the deeply embedded infrared bipolar outflow source S140 IRS1, a
massive protostellar object in the L1204 molecular cloud. Using the SAO
6m
telescope, we obtained 280 mas resolution polarization maps of S140
IRS1 as well as a K-band image with diffraction-limited resolution
lambda/D of 76 mas, which is the highest angular resolution image of a
young outflow source ever obtained in the infrared. Our data suggest
that the central source is marginally resolved with a FWHM diameter of
approximately 20 mas (~20 AU). The most remarkable feature in our
image is a bright extended and very clumpy structure pointing away from
the central source in exactly the same direction as the blue-shifted CO
outflow lobe. A centro-symmetric pattern of high polarization in this
feature suggests that we see scattered light from the central source.
We interprete this feature as the clumpy inner surface of a partially
evacuated cavity in the circumstellar envelope around IRS1, which has
been
excavated by the strong outflow from IRS1.
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