| Issue |
A&A
Volume 384, Number 2, MarchIII 2002
|
|
|---|---|---|
| Page(s) | 629 - 637 | |
| Section | The Sun | |
| DOI | https://doi.org/10.1051/0004-6361:20020067 | |
| Published online | 15 March 2002 | |
Interstellar C
toward HD 210121*
1
LUTH and FRE 2462 du CNRS, Observatoire de Paris-Meudon, 92195 Meudon, France e-mail: Evelyne.Roueff@obspm.fr
2
LESIA and FRE 2461 du CNRS, Observatoire de Paris-Meudon, 92195 Meudon, France e-mail: Paul.Felenbok@obspm.fr
3
Centre for Astrophysics and Space Science, Chalmers University of Technology, Onsala Space Observatory, 43992 Onsala, Sweden e-mail: jblack@oso.chalmers.se
4
ISO Data Center, ESA Research and Scientific Support Department, PO Box 50727, 28080 Madrid, Spain e-mail: cgry@iso.vilspa.esa.es
Corresponding author: E. Roueff, Evelyne.Roueff@obspm.fr
Received:
9
August
2001
Accepted:
7
January
2002
We report the detection of the 405 nm band of interstellar C3 in absorption toward HD 210121. The abundance of triatomic carbon is approximately 1/17 of that of diatomic carbon in the same diffuse molecular cloud. Rotational levels of C3 up to 
are seen in this cloud. The rotational excitation of C3 in the interstellar medium may reflect a competition between inelastic collisions, formation and destruction of the molecule, and radiative pumping in the far-infrared. The abundance of C3 is compared with chemical models. Attention is called to molecular properties that need to be better determined.
Key words: astrochemistry / molecular data / molecular processes / ISM: molecules
© ESO, 2002
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