Non-LTE gallium abundance in HgMn stars*
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, firstname.lastname@example.org
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