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

4. Conclusions

The present calculations of the potential energy function and the dipole moment of the state of SiO have been used to obtain Einstein coefficients for vibrational transitions in the ground state and IR opacities. The results agree well with the experimental data of Raymonda et al. (1970 ) for and an extensive comparison with previous ab initio calculations allows us to conclude that the permanent dipole moment for these vibrational levels has been determined to better than accuracy. The Einstein coefficients for rovibrational transitions are larger than the currently used values of Tipping & Chackerian (1981 ), and should be tested in models of stellar atmospheres in conjunction with high resolution observations of the first overtone. Our ab initio data display an actual improvement. Moreover, new experimental measurements for the dipole moment in higher vibrational states should be very useful. Infrared data are available at the Centre de Données de Strasbourg.

© European Southern Observatory (ESO) 1997

Online publication: July 3, 1998
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