Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...255l..69j&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 255, Apr. 1, 1982, p. L69-L73. Research supported by the University
Astronomy and Astrophysics
Astrophysics
9
Acetylene, Cyano Compounds, Electron Transitions, Interstellar Chemistry, Stellar Envelopes, Stellar Evolution, Carbon Stars, Cyanoacetylene, Molecular Clouds, Radial Velocity, S Stars, Stellar Temperature, Supergiant Stars
Scientific paper
A search for the J = 10-9 transition of cyanoacetylene (HC3N) in circumstellar molecular envelopes has resulted in new detections of CIT 6 (definite) and GL 3068 (probable). The 17 sources surveyed included a mixture of carbon-rich, oxygen-rich, and S-type stars, and the previously known source IRC + 10216. Four circumstellar shells have now been identified as sources of HC3N emission. IRC + 10216, CIT 6, and GL 3068 are cool, carbon-rich giants; the remaining object, GL 2688, which is not included in this study, consists of a much hotter supergiant surrounded by a carbon-rich nebula. It was not possible to detect HC3N from any oxygen-rich shell, including W Hydrae, once reported as an HC3N source. The prospects for extending the list of molecules and host circumstellar sources and the potential of circumstellar HC3N as a tool for the study of circumstellar shells and the chemistry of long-chain carbon molecules are discussed.
Jewell Phil R.
Snyder Lewis E.
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