| Issue |
A&A
Volume 373, Number 3, July III 2001
|
|
|---|---|---|
| Page(s) | 998 - 1008 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361:20010663 | |
| Published online | 15 July 2001 | |
Statistical equilibrium and photospheric abundance of silicon in the Sun and in Vega*
Institut für Theoretische Physik und Astrophysik, Universität Kiel, 24098 Kiel, Germany
Received:
12
February
2001
Accepted:
2
May
2001
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
.
For the prototype A0 V star Vega the non-LTE effects are
small, too. With a non-LTE abundance correction of
, a silicon abundance of
is derived, implying a deficiency of
-0.599 dex with respect to the Sun. This confirms the
classification of Vega as a mild λ Boo star.
Key words: Sun: abundances / stars: abundances / atomic data
© ESO, 2001
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