Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...287l..95l&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 287, Dec. 15, 1984, p. L95-L98.
Astronomy and Astrophysics
Astrophysics
11
Abundance, Carbon, Diatomic Molecules, Interstellar Matter, Iue, Vibrational Spectra, Near Infrared Radiation, Oscillator Strengths, Signal To Noise Ratios
Scientific paper
The 0-0 vibrational band of the F1Pi(u)-X1Sigma(+)g electronic system of C2 has been detected with the IUE in the interstellar medium along the line of sight toward X Per. A column density of 3 (+ or - 1) x 10 to the 12th/f(00) per sq cm was derived by a profile fitting method. The lower limit for 0-0 band oscillator strength was determined from a comparison of the upper limits of observations of the A-X and D-X systems, and an excitation temperature of 40 K was also obtained from the profile fitting. A statistical calculation of the level population with radiative pumping shows that the 0-0 band profile corresponds to a range of values for kinetic temperature, density, and near-IR radiation. An upper limit of 50 K for kinetic temperature was determined from the statistical equilibrium analysis.
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