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Astron. Astrophys. 319, 720-724 (1997)

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Infrared transitions probabilities and radiative opacity of SiO

I. Drira 1, J. M. Huré 2, A. Spielfiedel 1, N. Feautrier 1 and E. Roueff 2

1 DAMAP and URA 812 du CNRS, Observatoire de Paris, F-92195 Meudon Cedex, France
2 DAEC and URA 173 du CNRS, Observatoire de Paris, F-92195 Meudon Cedex, France

Received 19 June 1996 / Accepted 20 August 1996

Abstract

Spectroscopic properties of SiO have been calculated from highly correlated wave functions. The computed dipole moments for [FORMULA] agree well with the experimental data of Raymonda et al. (1970). By comparing the present results with previous theoretical works, we estimate that the resulting line strengths should be the most accurate to date. The Einstein coefficients for the fundamental and the first overtone ([FORMULA], [FORMULA]) are larger than the currently used values of Tipping & Chackerian (1981), and should be tested in models of stellar atmospheres.

Key words: infrared: general – molecular data – stars: AGB and post-AGB – ISM: molecules

Send offprint requests to: A. Spielfiedel

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© European Southern Observatory (ESO) 1997

Online publication: July 3, 1998
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