Near-Infrared Monitoring of the Carbon Star IRC +10 216: A High Spatial-Resolution Time Sequence of Dust-Shell Evolution
نویسندگان
چکیده
منابع مشابه
The dynamical evolution of the fragmented , bipolar dust shell around the carbon star IRC + 10 216 ⋆ Rapid changes of a PPN - like structure ?
We present high–resolution J–, H–, and K–band observations and the first H − K color image of the carbon star IRC +10 216. The images were reconstructed from 6 m telescope speckle interferograms using the bispectrum speckle interferometry method. The H and K images with resolutions between 70 mas and 92 mas consist of several compact components within a 0. ′′2 radius and a fainter asymmetric ne...
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12 CO and 13 CO J = 6-5 observations of IRC +10 216 with the JCMT are presented. A spherically symmetric radia-tive transfer code is used to model these and other CO observations of the carbon star IRC +10 216/CW Leo. Compared to previously published model calculations a much larger set of observational data is used as constraints; on-source 12 CO and 13 CO J = 1-0 up to J = 6-5 and mapping dat...
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The hypergiant IRC +10 420 is a unique object for the study of stellar evolution since it is the only object that is believed to be witnessed in its rapid transition from the red supergiant stage to the Wolf-Rayet phase. Its effective temperature has increased by 1000–2000 K within only 20 yr. We present the first speckle observations of IRC +10 420 with 73 mas resolution. A diffraction-limited...
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We describe Very Large Array observations of the extreme carbon star IRC+10216 at 8.4, 14.9, and 22.5 GHz made over a two year period. We find possible variability correlated with the infrared phase and a cm-to sub-millimeter wavelength spectral index very close to 2. The variability, observed flux densities, and upper limit on the size are consistent with the emission arising from the stellar ...
متن کاملA C - Band Spectral Scan of Irc + 10 216
We report the results of the presently lowest frequency spectral line survey of the asymptotic giant branch carbon star IRC+10 216. The entire Arecibo C band (4–6 GHz) was observed with a noise level of 0.3 mJy (1 ). We report the detection of HC5N (J 1⁄4 2 1), which is the lowest frequency transition of the HC5N molecule found in the envelope of IRC +10 216. The HC5N J 1⁄4 2 column density der...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 2003
ISSN: 0074-1809
DOI: 10.1017/s0074180900208152