PROBING THE MASS-LOSS HISTORY OF THE YELLOW HYPERGIANT IRC+10420

@article{DinhVTrung2009PROBINGTM,
  title={PROBING THE MASS-LOSS HISTORY OF THE YELLOW HYPERGIANT IRC+10420},
  author={Dinh-V-Trung and S{\'e}bastien Muller and Jeremy Lim and Sun Kwok and C. Muthu},
  journal={The Astrophysical Journal},
  year={2009},
  volume={697},
  pages={409 - 419}
}
We have used the submillimeter array to image the molecular envelope around the yellow hypergiant IRC+10420. Our observations reveal a large and clumpy expanding envelope around the star. The molecular envelope shows a clear asymmetry in 12CO J = 2–1 emission in the southwest direction. The elongation of the envelope is found even more pronounced in the emission of 13CO J = 2–1 and SO JK = 65–54. A small positional velocity gradient across velocity channels is seen in these lines, suggesting… 

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References

SHOWING 1-10 OF 28 REFERENCES

Arcsecond-resolution 12CO mapping of the yellow hypergiants IRC +10420 and AFGL 2343

IRC +10420 and AFGL 2343 are the unique, known yellow hypergiants (YHGs) presenting a heavy circumstellar envelope (CSE). We aim to study the morphology, exceptional kinematics, and excitation

The Molecular Envelope around the Red Supergiant VY CMa

We present millimeter interferometric observations of the molecular envelope around the red supergiant VY CMa with the Submillimeter Array (SMA). The high angular resolution (<2'') allows us to

Integral-Field Spectroscopy of the Post-Red Supergiant IRC +10420: Evidence for an Axisymmetric Wind

We present NAOMI/OASIS adaptive-optics-assisted integral-field spectroscopy of the transitional massive hypergiant IRC +10420, an extreme mass-losing star apparently in the process of evolving from a

The spectral energy distribution and mass-loss history of IRC + 10420

We present a study of the spectral energy distribution of the peculiar hypergiant IRC + 10420. To this end we have collected published photometry of IRC + 10420 and obtained some new data, in order

The yellow hypergiants

We list the main stellar data of known hypergiants and similarly luminous stars, and then concentrate on a review of the yellow hypergiants. These stars are post-red supergiants evolving along

High resolution spectroscopy of the post-red supergiant IRC+10420 - I. The data

A high resolution optical spectrum of the post-red supergiant candidate IRC+10420 is presented. The Utrecht Echelle Spectrograph observations, with a total integration time of more than 9 hours!

The chemical composition of the circumstellar envelopes around yellow hypergiant stars

Context. The yellow hypergiant stars (YHGs) are extremely luminous and massive objects whose general properties are poorly known. Only two of this kind of star show massive circumstellar envelopes,

IRC +10420 - A cool hypergiant near the top of the H-R diagram

New data are reported for the OH/IR star IRC+10420, including optical/infrared imaging, spectroscopy, polarimetry, and photometry. We conclude the following: 1. The optical spectrum is that of a very

Mass, linear momentum and kinetic energy of bipolar flows in protoplanetary nebulae

We have studied the CO emission from protoplanetary nebulae (PPNe). Our sample is composed of 37 objects and includes, we think, all well identied PPNe detected in CO, together with the two yellow

Optical spectrum of the IR source IRC + 10420 in 1992-1996

To understand the evolutionary stage of the peculiar supergiant IRC+10420, we have been taking spectra for several years at the 6m telescope. The optical spectrum of IRC+10420 of the years from 1992