Volume 426, Number 2, November I 2004
|Page(s)||517 - 521|
|Section||Interstellar and circumstellar matter|
|Published online||11 October 2004|
The quest for CN in space
A search with the IRAM 30 m telescope towards IRC+10216
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany e-mail: [fuchs;feldt]@ph1.uni-koeln.de
2 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany e-mail: email@example.com
Accepted: 29 June 2004
An extensive search for the linear C2N radical towards the circumstellar envelope IRC+10216 has been performed. Eight frequency bands of the rotational transitions J = 7/2–5/2 up to 13/2–11/2 and 17/2–15/2 up to 23/2–21/2 of the C2N molecule including their λ-doubling components have been probed, using the IRAM 30 m telescope at Pico Veleta, Spain. However, there is no evidence for the existence of the C2N radical towards IRC+10216. Instead, a new upper limit cm-2 for the column density of C2N was estimated. Additionally, at least ten yet unidentified lines have been found.
Key words: molecular processes / stars: AGB and post-AGB / stars: carbon / circumstellar matter
© ESO, 2004
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