Journal ArticleDOI
Plateau De Bure Observations of IRC+10216: High Sensitivity Maps of SiC2, SIS, and CS
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TLDR
In this paper, high angular resolution and high sensitivity maps of IRC+10216 were obtained, showing that the molecules SiS and CS are mostly found in the inner parts of the envelope, but are still detectable in the outer region (r ~ 15”) where the products of photochemistry are found.Abstract:
We have obtained high angular resolution ~ 3”), and high sensitivity maps of IRC+10216. SiC2 is found both in a spherical shell and in the very central region, indicating it is formed both in the inner envelope close to the star, and in the outer shell. The molecules SiS and CS are mostly found in the inner parts of the envelope, but are still detectable in the outer region (r ~ 15”) where the products of photochemistry are found. The maps show that IRC+10216 has a very clumpy envelope, with strong departures from spherical symmetry; an axis oriented NS-SW (P.A. 20°) can be seen in all maps. The radial brightness distribution of CS has secondary maxima, at the radius where the SiC2 shell has its peak emission. A preliminary map shows CN in the same shell, but also in a still larger outer shell. Time variations in the mass loss rate, could be invoked to explain the multiple shell structure of this envelope.read more
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Journal ArticleDOI
Structures of Silicon-Doped Carbon Clusters
James L. Fye,Martin F. Jarrold +1 more
TL;DR: In this article, gas phase ion mobility measurements have been used to examine the geometries of silicon-doped carbon cluster cations, CnSi+ (n = 3−69).
Journal ArticleDOI
Molecular abundances in the inner layers of IRC +10216
Marcelino Agúndez,Marcelino Agúndez,José Pablo Fonfría,José Cernicharo,Claudine Kahane,Fabien Daniel,Michel Guélin +6 more
TL;DR: In this article, a large number of rotational transitions covering a wide range of energy levels, including highly excited vibrational states, are detected in emission and serve to trace different regions of the envelope.
Journal ArticleDOI
A Detailed Analysis of the Dust Formation Zone of IRC +10216 Derived from Mid-Infrared Bands of C2H2 and HCN
José Pablo Fonfría,José Cernicharo,Matthew J. Richter,Matthew J. Richter,John H. Lacy,John H. Lacy +5 more
TL;DR: In this article, a spectral survey of IRC+10216 has been carried out in the range 11 to 14 m with a spectral resolution of about 4 km s −1, and the authors have identified a forest of lines in six bands of C2H2 involving the ground to 3ν5 and in two bands of HCN, involving the vibrational states from the ground up to 2ν2.
Journal ArticleDOI
Detection of the SiNC radical in IRC+10216
TL;DR: The microwave spectra of free radical SiNC and its isomer SiNC were studied in the laboratory and their rotational transition frequencies are accurately known in this paper, where five weak lines were detected with the IRAM 30-m telescope at the frequencies of the J = 6.5 → 5.8 GHz, each with Λ-doubling.
Journal ArticleDOI
The inner wind of IRC+10216 revisited: new exotic chemistry and diagnostic for dust condensation in carbon stars
TL;DR: In this paper, the chemistry of the inner wind of the carbon star IRC+10216 and the effects of periodic shocks induced by the stellar pulsation on the gas to follow the non-equilibrium chemistry in the shocked gas layers.
References
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Chemistry and spectroscopy of interstellar molecules
TL;DR: In this article, the soft file concept is used to find and get this chemistry and spectroscopy of interstellar molecules by reading this site and the best product, always and always.
Journal ArticleDOI
The distribution of molecules in the circumstellar envelope of IRC +10216: HC3N, C3N, and SiS
John H. Bieging,Mario Tafalla +1 more
TL;DR: In this article, the authors presented aperture synthesis images made with the BIMA mm interferometer of molecular emission lines of HC 3 N, C 3 N and SiS at ∼109 GHz toward the carbon star IRC +10216.
Journal ArticleDOI
Observations of 13.5 Micron Rotation-Vibration Lines of SiS in IRC +10216
TL;DR: In this paper, the first observations of the 13.5 micron fundamental band of SiS in the spectrum of the heavily obscured carbon star IRC +10216 were reported, where lines are formed in the inner region of the circumstellar envelope where the gas is accerlerating and where the temperature ranges from 800-500 K.
Journal Article
Molecular ions in the circumstellar envelope of IRC+10216
TL;DR: In this article, the spatial distribution of ionization in a C-rich circumstellar envelope (CSE) is calculated, and it is shown that molecular ions dominate the ionization and chemistry of a large part of the CSE.
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