Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apjs...52..443b&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 52, Aug. 1983, p. 443-450.
Astronomy and Astrophysics
Astrophysics
11
Molecular Rotation, Stellar Spectra, Vibrational Spectra, Yttrium Oxides, Emission Spectra, Franck-Condon Principle, Molecular Energy Levels, S Stars, Spectral Bands
Scientific paper
Rotational analyses are extended to the emission spectra of several more bands in the delta upsilon = 0, -1 sequences of the A2Pi-X2Sigma+ system of yttrium monoxide excited in the discharge of a hollow cathode tube. Accurate positions for 69 band heads are presented, 12 of which, principally in the delta upsilon = -1 sequence (up to the 22-23 band), are observed for the first time. A consistent set of accurate rotational and vibrational constants is obtained for both states, up to upsilon double prime = 10 and upsilon prime = 9, from global band fittings; the upsilon-connected bands are treated simultaneously. It is noted that this corresponds to the reduction of approximately 3000 line wave numbers.
Bernard Alain
Gravina R.
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