| Issue |
A&A
Volume 426, Number 2, November I 2004
|
|
|---|---|---|
| Page(s) | 517 - 521 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20047177 | |
| Published online | 11 October 2004 | |
The quest for C
N in space
A search with the IRAM 30 m telescope towards IRC+10216
1
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: wyrowski@mpifr-bonn.mpg.de
Received:
31
January
2004
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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