Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apjs...74..769g&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 74, Nov. 1990, p. 769-783.
Astronomy and Astrophysics
Astrophysics
6
Carbon Stars, Cassiopeia Constellation, Electron Transitions, Forbidden Bands, High Resolution, Infrared Spectra, Near Infrared Radiation, Signal To Noise Ratios
Scientific paper
The bands of C2 are an important source of opacity in the near-infrared spectral region of carbon stars. In the 2 micron spectral region, the Delta v = -1 and -2 transitions of the Ballik-Ramsay b 3Sigma(g)(-) - a 3Pi(u) system are especially important. A general method for calculating highly accurate transition parameters of the Ballik-Ramsay band is presented. This method allows the easy calculation of the satellite lines and the forbidden lines resulting from the perturbation of the upper b 3Sigma(g)(-) state by the X 1Sigma(0)(+) state. Included in the calculation is the effect of the isotopic molecules (C-12)2, (C-12)(C-13), and (C-13)2. Three consistency tests of the calculated strengths are presented. A comparison of synthetic spectra is made with an observed spectrum of WZ Cas in the 3940/cm spectral region.
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