A spectral line survey of IRC +10216 between 13.3 and 18.5 GHz

Abstract

A spectral line survey of IRC +10216 between 13.3 and 18.5 GHz is carried out using the Shanghai Tian Ma 65 m Radio Telescope (TMRT-65m) with a sensitivity of < 7 mK. Thirty-five spectral lines of 12 different molecules and radicals are detected in total. Except for SiS, the detected molecules are all carbon-chain molecules, including HC3N, HC5N, HC7N, HC9N, C6H, C6H-, C8H, SiC2, SiC4, c-C3H2 and l-C5H. The presence of rich carbon-bearing molecules is consistent with the identity of IRC +10216 as a carbon-rich AGB star. The excitation temperatures and column densities of the observed species are derived by assuming a local thermodynamic equilibrium and homogeneous conditions.

This is the authors' version of the manuscript; 16 pages, 5 figures, 6 tables; Accepted for publication in A&A 8/17/2017

References in corpus (13)

• Detection of C5N- and vibrationally excited C6H in IRC +10216
• New molecules in IRC+10216: confirmation of C${}_5$S and tentative identification of MgCCH, NCCP, and SiH${}_3$CN
• Detection of circumstellar CH2CHCN, CH2CN, CH3CCH and H2CS
• A Detailed Analysis of the Dust Formation Zone of IRC+10216 Derived from Mid-IR Bands of C2H2 and HCN
• Discovery of SiCSi in IRC+10216: A missing link between gas and dust carriers of SiC bonds
• Molecular shells in IRC+10216: tracing the mass loss history
• A spectral line survey in the 2 mm and 1.3 mm windows toward the carbon rich envelope of IRC +10216
• Discovery of Time Variation of the Intensity of Molecular Lines in IRC+10216 in The Submillimeter and Far Infrared Domains
• Tentative detection of phosphine in IRC+10216
• The 12CO/13CO ratio in AGB stars of different chemical type-Connection to the 12C/13C ratio and the evolution along the AGB
• Si-bearing molecules towards IRC+10216: ALMA unveils the molecular envelope of CWLeo
• A 1.3 cm line survey toward IRC +10216
• The complex dust formation zone of the AGB star IRC+10216 probed with CARMA 0.25 arcsec angular resolution molecular observations

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• A Possible Chemical Clock in High-mass Star-forming Regions: N(HC3N)/N(N2H+)?
• The spectra of evolved stars at 20--25\,GHz: tracing circumstellar chemistry during the asymptotic giant branch to planetary nebula transition
• A 3 mm Molecular Line Survey toward The C-star Envelope CIT 6