Diffraction-limited bispectrum speckle interferometry of the
Herbig Be star R Mon
Gerd Weigelt, Yuri Y. Balega, Karl-Heinz Hofmann, Thomas Preibisch
Astronomy & Astrophysics, 392, 937 (2002)
We explore the structures immediately surrounding
the intermediate-mass young stellar object R Mon with
bispectrum speckle interferometry, conventional near-infrared imaging
and by analyzing optical HST archive data.
Our near-infrared speckle images with unprecedented diffraction-limited
resolution of 55 mas (~ 44 AU; H-band)
and 76 mas (~ 61 AU; K-band) represent the highest
resolution R Mon images obtained so far
and exhibit previously unseen complex structures.
While the binary companion R Mon B appears as an unresolved
point source in our speckle images, the image of the primary R Mon A
is marginally extended in the K-band and significantly extended
in the H-band.
The most prominent new feature is a bright arc-shaped structure,
pointing away from R Mon in north-western direction.
We interpret this feature as the surface of a dense structure
near the thick circumstellar disk or torus around R Mon.
Our images also reveal several twisted filaments of helical shape
which are similar to the twisted filaments in the outer parts
of the nebula.
We identify structures which probably are responsible
for casting pronounced shadows in the outer regions
of the NGC 2261 reflection nebula.
Finally, we discuss the relation of the observed features,
in particular the arc-shaped speckle feature, to the
wind and outflow activity (Herbig-Haro objects and jets) of R Mon.
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