IMAGING THE COOL HYPERGIANT NML CYGNI'S DUSTY CIRCUMSTELLAR ENVELOPE WITH ADAPTIVE OPTICS

@article{Schuster2009IMAGINGTC,
  title={IMAGING THE COOL HYPERGIANT NML CYGNI'S DUSTY CIRCUMSTELLAR ENVELOPE WITH ADAPTIVE OPTICS},
  author={Michael T. Schuster and Massimo Marengo and Joseph L. Hora and Giovanni G. Fazio and Roberta M. Humphreys and Robert D. Gehrz and Philip M. Hinz and Matthew A. Kenworthy and William F. Hoffmann},
  journal={The Astrophysical Journal},
  year={2009},
  volume={699},
  pages={1423 - 1432}
}
We 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 ∼0.″3… 

SEARCHING FOR COOL DUST IN THE MID-TO-FAR INFRARED: THE MASS-LOSS HISTORIES OF THE HYPERGIANTS μ Cep, VY CMa, IRC+10420, AND ρ Cas

We present mid- and far-IR imaging of four famous hypergiant stars: the red supergiants μ Cep and VY CMa, and the warm hypergiants IRC +10420 and ρ Cas. Our 11–37 μm SOFIA/FORCAST imaging probes cool

Searching for Cool Dust. II. Infrared Imaging of The OH/IR Supergiants, NML Cyg, VX Sgr, S Per, and the Normal Red Supergiants RS Per and T Per

New MMT/MIRAC (9–11 μm), SOFIA/FORCAST (11–37 μm), and Herschel/PACS (70 and 160 μm) infrared (IR) imaging and photometry is presented for three famous OH/IR red supergiants (NML Cyg, VX Sgr, and S

A massive nebula around the luminous blue variable star RMC 143 revealed by ALMA

The luminous blue variable (LBV) RMC 143 is located in the outskirts of the 30 Doradus complex, a region rich with interstellar material and hot luminous stars. We report the 3σ sub-millimetre

SN Hunt 248: a super-Eddington outburst from a massive cool hypergiant

We present observations of SN Hunt 248, a new supernova (SN) impostor in NGC 5806, which began a multistage outburst in 2014 May. The ‘2014a’ discovery brightening exhibited an absolute magnitude of

Red Supergiants in the JWST Era. I. Near-IR Photometric Diagnostics

The Near Infrared Camera (NIRCam) on the James Webb Space Telescope (JWST) will be an incredibly powerful instrument for studying red supergiants (RSGs). The high luminosities and red peak

Distance and Size of the Red Hypergiant NML Cyg

Abstract We present astrometric results of phase-referencing VLBI observations of 22 GHz H2O maser and 43 GHz SiO maser emission towards the red hypergiant NML Cyg using VLBA. We obtained an annual

On the nature of candidate luminous blue variables in M 33

Luminous blue variables (LBVs) are a class of highly unstable stars that have been proposed to play a critical role in massive stellar evolution as well as being the progenitors of some of the most

Cold gas in hot star clusters: the wind from the red supergiant W26 in Westerlund 1

The massive red supergiant (RSG) W26 in Westerlund 1 is one of a growing number of RSGs shown to have winds that are ionized from the outside in. The fate of this dense wind material is important for

Herschel/HIFI observations of red supergiants and yellow hypergiants ⋆ , ⋆⋆ , ⋆⋆⋆ I. Molecular inventory

Context. Red supergiant stars (RSGs) and yellow hypergiant stars (YHGs) are believed to be the high-mass counterparts of stars in the asymptotic giant branch (AGB) and early post-AGB phases. As such,

References

SHOWING 1-10 OF 57 REFERENCES

Nonuniform Dust Outflow Observed around Infrared Object NML Cygni

Measurements by the University of California Berkeley Infrared Spatial Interferometer at 11.15 μm have yielded strong evidence for multiple dust shells and/or significant asymmetric dust emission

High-Resolution Imaging of Dust Shells by Using Keck Aperture Masking and the IOTA Interferometer

We present first results of an experiment to combine data from Keck aperture masking and the Infrared-Optical Telescope Array to image the circumstellar environments of evolved stars with ~20 mas

Radio continuum observations of NML Cygni.

An attempt to detect thermal radio emission from a compact circumstellar cloud about the infrared star NML Cyg has been carried out at three frequencies, 2.7, 8.1, and 10.5 GHz. Although positive

The Circumstellar Environments of NML Cygni and the Cool Hypergiants

We present high-resolution HST WFPC2 images of compact nebulosity surrounding the cool M-type hypergiants NML Cyg, VX Sgr, and S Per. The powerful OH/IR source NML Cyg exhibits a peculiar bean-shaped

The Asymmetric Nebula Surrounding the Extreme Red Supergiant Vy Canis Majoris

We present HST/WFPC2 images plus ground-based infrared images and photometry of the very luminous OH/IR star VY Canis Majoris. Our WFPC2 data show a complex distribution of knots and filamentary arcs

The nature of NML Cygnus

We suggest that H II region observed near NML Cygnus, a highly evolved mass-losing giant, results from the photoionization of the outflow by the luminous, hot stars in the Cyg OB2 association. NML

THE BALLOON-BORNE LARGE APERTURE SUBMILLIMETER TELESCOPE (BLAST) 2005: A 10 deg2 SURVEY OF STAR FORMATION IN CYGNUS X

We present Cygnus X in a new multi-wavelength perspective based on an unbiased BLAST survey at 250, 350, and 500 μm, combined with rich data sets for this well-studied region. Our primary goal is to

Bispectrum speckle interferometry observations and radiative transfer modelling of the red supergiant NML Cyg . Multiple dust-shell structures evidencing previous superwind phases

NML Cyg is a highly evolved OH/IR supergiant, one of the most prominent infrared objects due to its strong obscuration by dust, and supposed to be among the most luminous supergiants in the galaxy.

A Spitzer IRAC Search for Substellar Companions of the Debris Disk Star ϵ Eridani

We have used the Infrared Array Camera (IRAC) on board the Spitzer Space Telescope to search for low-mass companions of the nearby debris disk star ϵ Eri. The star was observed in two epochs 39 days

Proper motions of water vapour masers and bipolar outflow from NML Cygni

MERLIN observations of the 22-GHz H 2 O masers in the circumstellar envelope of the supergiant NML Cyg show an irregular ring of emission 200 mas across, plus a pair of outlying features to the NW
...