Astron. Astrophys. Suppl. Ser. 142, 181-215
J. Cernicharo1 - M. Guélin2 - C. Kahane3
Send offprint request: J. Cernicharo
1 - CSIC, Instituto de Estructura de la Materia, C/Serrano 121, 28006 Madrid, Spain
2 - IRAM, Domaine Universitaire de Grenoble, 300 rue de la Piscine, 38406 St Martin d'Hères, France
3 - Laboratoire d'Astrophysique de l'Observatoire de Grenoble, BP. 53, 38041 Grenoble Cedex, France
Received April 23; accepted August 6, 1999
The new species include several carbon-chain molecules and radicals, as well as silicon and metallic compounds. They also include molecules containing rare isotopes of C, Mg, Si, S and Cl, whose elemental abundance ratios in the envelope are redetermined. We observe, in particular, four 13C isotopomers of C4H, three of C3N and HC3N, and four doubly-substituted isotopomers of SiS and CS.
63 lines remain unidentified. Probably, a large fraction of those are rotational transitions inside the excited bending states of the abundant species NaCN, C5H, and C6H. We can also expect some lines to be ground state transitions of poorly known silicon and metal compounds, such as the slightly asymmetrical top molecule SiCSi.
Key words: line identification -- surveys -- stars: AGB and post-AGB -- stars: carbon -- stars: circumstellar matter -- stars: individual: IRC+10216 -- ISM: molecules -- radio lines: stars