Bujarrabal et al. 1981

Bujarrabal, V., M. Guelin, M. Morris, and P. Thaddeus, 1981: The abundance and excitation of the carbon chains in interstellar molecular clouds. Astron. Astrophys., 99, 239-247.

Emission lines from the carbon chains HC_nN, n=3, 5, 7 and 9 have been observed at 3mm, 7mm and 1.4cm in a number of dark clouds, Orion A and IRC+10216. The data were interpreted by comparison to the results of non-LTE excitation calculations. Two component models for TMC-1 were constructed which suggest that, in contrast to previous studies, relative molecular abundances do not vary substantially along the cloud ridge, whereas the H₂ density does. All available data for carbon chains in other dark clouds are consistent with approximately constant relative carbon chain abundance: HC_nN/HC_n+2N ~ 2-3. This appears to differ from the Orion molecular cloud, in which HC₃N/HC₅N = 13±6. We argue that it is premature to derive abundance ratios for IRC+10216 because of the uncertainties in the excitation rates in this particular environment.

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Bujarrabal, V., Guelin, M., Morris, M., and Thaddeus, P.: The abundance and excitation of the carbon chains in interstellar molecular clouds, Astron. Astrophys., 99, 239-247, 1981.

Bujarrabal, V., M. Guelin, M. Morris, and P. Thaddeus (1981), The abundance and excitation of the carbon chains in interstellar molecular clouds, Astron. Astrophys., 99, 239-247.

Bujarrabal, V., M. Guelin, M. Morris, and P. Thaddeus, 1981: The abundance and excitation of the carbon chains in interstellar molecular clouds. Astron. Astrophys., 99, 239-247.

Bujarrabal, V., Guelin, M., Morris, M., & Thaddeus, P. 1981, Astron. Astrophys., 99, 239.

Bujarrabal V, Guelin M, Morris M, Thaddeus P. The abundance and excitation of the carbon chains in interstellar molecular clouds, Astron Astrophys 1981;99:239-247.

V. Bujarrabal, M. Guelin, M. Morris, P. Thaddeus, Astron. Astrophys. 99, 239-247 (1981).