New circumstellar cyanoacetylene sources

Abstract

view Abstract Citations (11) References (36) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS New circumstellar cyanoacetylene sources. Jewell, P. R. ; Snyder, L. E. Abstract 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. Publication: The Astrophysical Journal Pub Date: April 1982 DOI: 10.1086/183771 Bibcode: 1982ApJ...255L..69J Keywords: Acetylene; Cyano Compounds; Electron Transitions; Interstellar Chemistry; Stellar Envelopes; Stellar Evolution; Carbon Stars; Cyanoacetylene; Molecular Clouds; Radial Velocity; S Stars; Stellar Temperature; Supergiant Stars; Astrophysics full text sources ADS | data products SIMBAD (17)