Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...95..301m&link_type=abstract
The Astrophysical Journal Supplement Series, vol. 95, no. 1, p. 301-343
Astronomy and Astrophysics
Astronomy
100
Absorption Spectra, Absorption Spectroscopy, Abundance, Diatomic Molecules, Electron Transitions, Electronic Spectra, Molecular Oscillators, Oscillator Strengths, Damping, Hubble Space Telescope, Iue, Line Spectra, Perturbation, Rotational States, Spectrographs, Ultraviolet Astronomy, Vibrational Spectra
Scientific paper
This compilation lists wavenumbers, wavelengths, and oscillator strengths for 1589 electronic transitions of (12)C(16)O, (13)C(16)O, (12)C(18)O, and (13)C(18)O between 1000 and 1545 A. These are the transitions from J double prime = 0 to 6 and v double prime = 0 of the ground term which are most likely to appear as interstellar absorption lines in spectra observed with the Hubble Space Telescope and other instruments in space. We include a derivation of the formulae relating transition probabilities, lifetimes, line strengths, and oscillator strengths for individual rovibronic transitions and whole bands. The compilation contains all the known spin-permitted bands A1Pi - X1Sigma+, B1Sigma+ - X1Sigma+, C1Sigma+ - X1Sigma+, E1Pi - X1Sigma+, and F1Sigma+ - X1Sigma+, as well as the spin-forbidden a'3Sigma+ - X1Sigma+, d3delta - X1Sigma+ and e3Sigma- - X1Sigma+ bands which are enhanced by perturbations of A1Pi on certain of their upper levels. Oscillator strengths are quoted for each rovibronic transition, taking account of the mixing of the triplet states with A1 Pi, v' = 0 to 6. A separate finding list orders the stronger transitions with J double prime less than or equal to 3 by wavelength. Comparison of the compiled data with existing UV observations of HD 27778, zeta Oph, and 20 Aql shows how the a' - X, d - X, and e - X bands that borrow oscillator strength from A - X can account for several puzzling absorption features. Finally, we include some suggestions for further study with spectrographs in the laboratory and in space.
Morton Donald C.
Noreau Louis
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