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Astron. Nachr. / AN 326 (2005), Suppl. Issue 7 -- Short Contributions AG 2005 KÆln 1
Bispectrum speckle imaging of the ultracompact HII region K3­50A
STEFAN KRAUS 1 , YURI Y. BALEGA 2 , KARL­HEINZ HOFMANN 1 , THOMAS PREIBISCH 1 ,
GERD WEIGELT 1
1 Max­Planck­Institut fÝr Radioastronomie, Auf dem HÝegel 69, 53121 Bonn, Germany
2 Special Astrophysical Observatory, Nizhnij Arkhyz, Karachai­Cherkesia 357147, Russia
skraus@mpifr­bonn.mpg.de
We present K # ­band bispectrum speckle interferometry of the ultracompact H II region K3­50A. Our image
resolves the central 1 ## â 1 ## region into at least 7 point­like objects. We find K # ­band counterparts for all but
one of the N­band sources discovered by Okamoto et al. (2003), and there are additional K # ­band sources which
were unresolved in the N­band images. Our reconstructed image also reveals the fine­structure of the cone­shaped
nebulosity extending to the south. The brightest K # ­band source is located exactly at the tip of the cone­shaped
nebulosity. The nebula shows several arcs and the orientation of its main axis agrees very well with the direction
of the CO outflow from K3­50A. This nebulosity therefore very likely represents the clumpy inner surface of a
partially evacuated cavity excavated by the strong outflows.