Observations of interstellar C2 toward three heavily reddened stars

Details Observations of interstellar C2 toward three heavily reddened stars Observations of interstellar C2 toward three heavily reddened stars

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...271l.101l&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 271, Aug. 15, 1983, p. L101-L105.

Astronomy and Astrophysics

Astrophysics

23

Abundance, Carbon, Interstellar Chemistry, Molecular Clouds, Early Stars, Molecular Excitation, Molecular Rotation, Radiative Transfer

Scientific paper

Observations have been made of the 2-0 band of the Phillips system of interstellar C2 toward the heavily obscured early-type stars VI Cygni No. 12, HD 29647, and BD +66.1675 deg. The first direct proof that the rotational excitation temperatures of interstellar C2 are nonthermal was obtained. Toward VI Cygni No. 12, the rotational distribution cannot be characterized by a single, unique excitation temperature; the distribution is consistent with radiative pumping models. A very strong linear correlation was found between N(C2) and E(B-V), which suggests that the relative abundance of C2 is insensitive to a wide variation in physical conditions.

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