Diffraction-limited bispectrum speckle interferometry and
speckle polarimetry of the young bipolar outflow source S140 IRS1
D. Schertl, Y. Balega, T. Hannemann, K.-H. Hofmann,
Astronomy & Astrophysics, 361, L29 (2000)
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 6 m 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
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
in the circumstellar envelope around IRS1, which
has been excavated by the strong outflow from IRS1.
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