EDP Sciences
Free access
Volume 426, Number 2, November I 2004
Page(s) 517 - 521
Section Interstellar and circumstellar matter
DOI http://dx.doi.org/10.1051/0004-6361:20047177

A&A 426, 517-521 (2004)
DOI: 10.1051/0004-6361:20047177

The quest for C $_\mathsf{2}$N in space

A search with the IRAM 30 m telescope towards IRC+10216
G. W. Fuchs1, U. Fuchs1, T. F. Giesen1 and F. Wyrowski


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 C 2N 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 C 2N molecule including their $\lambda$-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 C 2N radical towards IRC+10216. Instead, a new upper limit $N_{\rm T} = 3.8 \times 10^{-12}$ cm -2 for the column density of C 2N 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

SIMBAD Objects

© ESO 2004