M. T. Schuster et al. 2009 ApJ 699 1423 doi:10.1088/0004-637X/699/2/1423
IMAGING THE COOL HYPERGIANT NML CYGNI'S DUSTY CIRCUMSTELLAR ENVELOPE WITH ADAPTIVE OPTICS
FREE ISSUEM. T. Schuster1, M. Marengo1, J. L. Hora1, G. G. Fazio1, R. M. Humphreys2, R. D. Gehrz2, P. M. Hinz3, M. A. Kenworthy3 and W. F. Hoffmann3
Show affiliationsWe present subarcsecond angular resolution, high-Strehl ratio mid-IR adaptive optics images of the powerful OH/IR source and cool hypergiant NML Cyg at 8.8, 9.8, and 11.7 μm. These images reveal once more the complexity in the dusty envelope surrounding this star. We spatially resolve the physical structures (radius ~ 0
14, ~240 AU adopting a distance of 1.74 kpc) responsible for NML Cyg's deep 10 μm silicate dust absorption feature. We also detect an asymmetric excess, at separations of ~03-05 (~520-870 AU), northwest from the star. The colors of this excess are consistent with thermal emission of hot, optically thin dust. This excess is oriented in the direction of the Cyg OB2 stellar association, and is likely due to the disruption of NML Cyg's dusty wind with the near-UV radiation flux from the massive hot stars within Cyg OB2. This interaction was predicted in our previous paper to explain the geometry of an inverted photodissociation region observed at optical wavelengths.
- Keywords
circumstellar matter; infrared: stars; open clusters and associations: individual (Cyg OB2); stars: imaging; stars: individual (NML Cyg); stars: mass loss
- Dates
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Issue 2 (2009 July 10)
Received 2008 May 24, accepted for publication 2009 May 8
Published 2009 June 23
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Imaging the Cool Hypergiant NML Cygni's Dusty Circumstellar Envelope with Adaptive Optics
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