Rotational equilibrium of C2 in diffuse interstellar clouds. I - Static model: the case of Zeta Ophiuchi

Details Rotational equilibrium of C2 in diffuse interstellar clouds. I - Static model: the case of Zeta Ophiuchi Rotational equilibrium of C2 in diffuse interstellar clouds. I - Static model: the case of Zeta Ophiuchi

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...188..137l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 188, no. 1, Dec. 1987, p. 137-144.

Astronomy and Astrophysics

Astrophysics

13

Astronomical Models, Carbon, Interstellar Matter, Molecular Clouds, Molecular Diffusion, Atomic Collisions, Chemical Equilibrium, Density Distribution

Scientific paper

A detailed calculation of the statistical equilibrium of C2 under conditions prevailing in diffuse interstellar clouds is presented. New molecular data are used which allow for the consideration of each individual transition; cascade coefficients are built to make the computation tractable. The model is applied to the line of sight toward ζ Oph. A class of models is found, characterised by the strength of the adopted radiation field, which accounts for both the excitation of the lower levels of H2 and most levels of C2.

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