On C3 molecules in diffuse interstellar clouds

Details On C3 molecules in diffuse interstellar clouds On C3 molecules in diffuse interstellar clouds

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.201..723c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 201, Nov. 1982, p. 723-733. Research supported by the Robert A. Welch F

Astronomy and Astrophysics

Astronomy

30

Carbon, Early Stars, Hot Stars, Interstellar Matter, Molecular Clouds, Stellar Spectrophotometry, Triatomic Molecules, Abundance, Interstellar Chemistry, Interstellar Extinction, Molecular Excitation, Reaction Kinetics, Spectrum Analysis, Stellar Spectra

Scientific paper

New observations at 4050 A of reddened stars are presented, the excitation of C3 levels is analyzed and the limits on C3 abundance are discussed. The details of the observed stars and obtained spectra are shown. Upper limits to the column density of C3 were calculated from the weak-line approximation for the absorption band equivalent width, and the radiative life-time of several vibrational levels in the upper 1-pi-u state was measured through a laser fluorescence technique. It is shown that the population of C3 molecules in excited vibrational states is neglible. The radiative deexcitation rate from v(2) = 1 is estimated from the harmonic oscillator relation, and the relative populations having v(2) = O and 1 are calculated. The C3 molecules are expected to be in the (0,0,0) ground vibrational state for which the rotational levels are thermalized. The interstellar C3 chemistry is examined, showing rates for reactions relevant to C3 formation and destruction. Predicted concentrations of C0, C2, and C3 are plotted as a function of visual extinction.

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