| Issue |
A&A
Volume 373, Number 3, July III 2001
|
|
|---|---|---|
| Page(s) | 987 - 992 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361:20010567 | |
| Published online | 15 July 2001 | |
Non-LTE gallium abundance in HgMn stars*
1
Astronomical Institute, Tatranská Lomnica, SK-059 60, Slovakia
2
School of Science and Mathematics, Sheffield Hallam University, Sheffield, S1 1WB, UK
Corresponding author: M. Zboril, zboril@ta3.sk
Received:
5
January
2000
Accepted:
19
April
2001
We present, for the first time, the Non-LTE gallium equivalent widths for the most prominent gallium transitions as identified in real spectra and in (hot) mercury-manganese star. The common feature of the departure coefficients is to decrease near the stellar surface, the collision rates are dominant in many cases and the Non-LTE equivalent widths are generally smaller. In particular, the abundance difference as derived from UV and visual lines is reduced. The photoionization cross sections were computed by means of standard R-matrix formalism.
Key words: stars: abundances / stars: atmospheres / stars: chemically peculiar
© ESO, 2001
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