Optical & Infrared
Karl-Heinz Hofmann, Yuri Y. Balega,
Thomas Preibisch, Gerd Weigelt
Peering into the heart of a high-mass star forming region:
bispectrum speckle interferometry of the ultracompact HII region
Astronomy and Astrophysics, 417, 981 (2004)
We present K'-band bispectrum speckle interferometry
of the ultracompact H II region K3-50A.
Our image resolves the central 1'' x 1'' region into at least 7
We find K'-band counterparts for all but one of the $N$-band sources
discovered by Okamoto et al. (2003), and there are additional K'-band sources
which were unresolved in the N-band images.
Our reconstructed image also reveals the fine-structure
of the cone-shaped nebulosity extending to the south.
The brightest K'-band source is located exactly at the tip of the
cone-shaped nebulosity. The nebula shows several arcs and
the orientation of its main axis agrees very well with the direction
of the CO outflow from K3-50A. This nebulosity therefore very likely
represents the clumpy inner surface of a partially
evacuated cavity excavated by the strong outflows.
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