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We present sub-arcsec angular resolution, high-Strehl ratio mid-IR adaptiveoptics images of the powerful OH/IR source and cool hypergiant NML Cyg at 8.8,9.8 and 11.7 um. These images reveal once more the complexity in the dustyenvelope surrounding this star. We spatially resolve the physical structures(radius ~0.14", ~240 AU adopting a distance of 1.74 kpc) responsible for NMLCyg's deep 10 um silicate dust absorption feature. We also detect an asymmetricexcess, at separations of ~0.3" to 0.5" (~520 to 870 AU), NW from the star. Thecolors of this excess are consistent with thermal emission of hot, opticallythin dust. This excess is oriented in the direction of the Cyg OB2 stellarassociation, and is likely due to the disruption of NML Cyg's dusty wind withthe near-UV radiation flux from the massive hot stars within Cyg OB2. Thisinteraction was predicted in our previous paper (Schuster et al. 2006), toexplain the geometry of an inverted photo-dissociation region observed atoptical wavelengths.

Imaging the Cool Hypergiant NML Cygni's Dusty Circumstellar Envelope with Adaptive Optics