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

@article{Monnier2004HighResolutionIO,
  title={High-Resolution Imaging of Dust Shells by Using Keck Aperture Masking and the IOTA Interferometer},
  author={John D. Monnier and Rafael Millan-Gabet and Peter G. Tuthill and Wesley A. Traub and Nathaniel P. Carleton and Vincent Coud{\'e} du Foresto and William C. Danchi and Marc G. Lacasse and S'ebastien Morel and Guy Perrin and Irene L. Porro and F. P. Schloerb and Charles H. Townes},
  journal={The Astrophysical Journal},
  year={2004},
  volume={605},
  pages={436 - 461}
}
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 resolution. The unique combination of excellent Fourier coverage at short baselines and high-quality long-baseline fringe data allows us to determine the location and clumpiness of the innermost hot dust in the envelopes and to measure the diameters of the underlying stars themselves. We find evidence… 

The Keck Aperture-masking Experiment: Near-Infrared Sizes of Dusty Wolf-Rayet Stars

We report the results of a high angular resolution near-infrared survey of dusty Wolf-Rayet stars using the Keck I Telescope, including new multiwavelength images of the pinwheel nebulae WR 98a, WR

The Keck Aperture Masking Experiment: Dust Enshrouded Red Giants

While the importance of dusty asymptotic giant branch (AGB) stars to galactic chemical enrichment is widely recognized, a sophisticated understanding of the dust formation and wind-driving mechanisms

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

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

THE KECK APERTURE MASKING EXPERIMENT: SPECTRO-INTERFEROMETRY OF THREE MIRA VARIABLES FROM 1.1 TO 3.8 μm

We present results from a spectro-interferometric study of the Miras o Cet, R Leo, and W Hya obtained with the Keck Aperture Masking Experiment from 1998 September to 2002 July. The spectrally

The Keck Aperture Masking Experiment: Multiwavelength Observations of Six Mira Variables

The angular diameters of six oxygen-rich Mira-type long-period variables have been measured at various NIR wavelengths using the aperture-masking technique in an extensive observing program from 1997

Observational evidence for the shrinking of bright maser spots

Context. The nature of maser emission means that the apparent angular size of an individual maser spot is determined by the local amplification process as well as by the instrinsic size of the

An extension of the DUSTY radiative transfer code and an application to OH 26.5 and TT Cygni

For the best-studied nearby Galactic asymptotic giant branch (AGB) stars a wealth of observational data is typically available in the form of photometry, often extending into the sub-mm, spectra

Imaging the outward motions of clumpy dust clouds around the red supergiant Antares with VLT/VISIR

We present a 0.5"-resolution diffraction-limited 17.7 micron image of the red supergiant Antares obtained with the VLT mid-infrared instrument VISIR. The VISIR image shows six clumpy dust clouds

FOUR DECADES OF IRC +10216: EVOLUTION OF A CARBON-RICH DUST SHELL RESOLVED AT 10 μm WITH MMT ADAPTIVE OPTICS AND MIRAC4 , ,

The evolved carbon-rich asymptotic giant branch star IRC +10216 (CW Leo) is the brightest mid-infrared source outside the solar system, as well as one of the closest examples of an evolved star

Mass Loss History of Evolved Stars

We provide high-resolution maps of the circumstellar dust shells of several dozen Asymptotic Giant Branch (AGB) stars using data from the Spitzer space telescope Multiband Imaging Photometer (MIPS)
...

References

SHOWING 1-10 OF 85 REFERENCES

Diffraction-limited Near-IR Imaging at Keck Reveals Asymmetric, Time-variable Nebula around Carbon Star CIT 6

We present multiepoch, diffraction-limited images of the nebula around the carbon star CIT 6 at 2.2 and 3.1 μm from aperture masking on the Keck I Telescope. The near-IR nebula is resolved into two

Infrared imaging of late-type stars

Infrared imaging properties of dusty winds around late-type stars are investigated in detail, employing a self-consistent model that couples the equations of motion and radiative transfer. Because of

On the Interferometric Sizes of Young Stellar Objects

Long-baseline optical interferometers can now detect and resolve hot dust emission thought to arise at the inner edge of circumstellar disks around young stellar objects (YSOs). We argue that the

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.

Mid-Infrared Interferometry on Spectral Lines. II. Continuum (Dust) Emission Around IRC +10216 and VY Canis Majoris

The University of California Berkeley Infrared Spatial Interferometer has measured the mid-infrared visibilities of the carbon star IRC +10216 and the red supergiant VY CMa. The dust shells around

Nonspherical Structures and Temporal Variations in the Dust Shell of o Ceti Observed with a Long Baseline Interferometer at 11 microns

Visibility observations at 11 μm of o Ceti have been made with the University of California (Berkeley) Infrared Spatial Interferometer during the time period 1988-1995. The observed visibilities

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

Spatially Resolved Circumstellar Structure of Herbig Ae/Be Stars in the Near-Infrared

We have conducted the first systematic study of Herbig Ae/Be stars using the technique of long baseline stellar interferometry in the near-infrared, with the objective of characterizing the

High angular resolution observations in the near infrared and modeling of the peculiar envelope of HD 62623

We report new observations of the peculiar star HD 62623 obtained with aperture masking interferometry performed on the Keck I telescope at λ = 1.24, 1.65, 2.26 and 3.08 $\rm \mu m$. The envelope

Proper Motions of New Dust in the Colliding Wind Binary WR 140

The eccentric W-R + O binary system WR 140 produces dust for a few months at intervals of 7.94 yr coincident with periastron passage. We present the first resolved images of this dust shell, at
...