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Issue A&A
Volume 373, Number 3, July III 2001
Page(s) 987 - 992
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20010567



A&A 373, 987-992 (2001)
DOI: 10.1051/0004-6361:20010567

Non-LTE gallium abundance in HgMn stars

M. Zboril1 and K. A. Berrington2

1  Astronomical Institute, Tatranská Lomnica, SK-059 60, Slovakia
2  School of Science and Mathematics, Sheffield Hallam University, Sheffield, S1 1WB, UK

(Received 5 January 2000 / Accepted 19 April 2001 )

Abstract
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

Offprint request: M. Zboril, zboril@ta3.sk


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