A&A 373, 998-1008
(Institut für Theoretische Physik und Astrophysik,
Universität Kiel, D-24098 Kiel, Germany),
Statistical equilibrium and photospheric abundance of silicon in the Sun and in Vega
Based on detailed non-LTE calculations, an updated determination of the abundance of silicon in the Sun and Vega is
presented. The model atom includes neutral and singly ionized stages of silicon with 115 energy levels and 84 line
transitions. Non-LTE effects are found to be quite small in the Sun. The mean non-LTE abundance correction is
-0.010 dex with respect to standard LTE calculations, leading to a
solar abundance of log e_NLTE = 7.550 +/- 0.056.
For the prototype A0 V star Vega the non-LTE effects are small, too. With a non-LTE abundance correction of
Delta(log e) = -0.054, a silicon abundance of log e_NLTE = 6.951 +/- 0.100 is derived, implying a deficiency of -0.599 dex with
respect to the Sun. This confirms the classification of Vega as a mild Boo star.
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