Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997astl...23..720p&link_type=abstract
Astronomy Letters, Volume 23, Issue 6, November 1997, pp.720-726; Pis'ma v Astronomicheskii Zhurnal, Vol. 23, p. 826
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The calculations of statistical equilibrium of lithium in the atmospheres of G-K giants are discussed. The studies are carried out for a 20-level model of the Li atom by the complete-linearization method. Allowance is made for the blanketing effect produced by atomic, ionic, and molecular absorption. The dependence of the parameters of Li absorption lines on the model-atmosphere parameters log g and [Fe/H] is analyzed. It is shown that: (i) the non-LTE effects in Li lines differ markedly for specific K giants; the abundance correction due to these effects varies over a wide range: from -0.4 dex (for HD 112127) to +0.2 dex (for Capella B); (ii) for K giants with T_eff < 4500 K, the non-LTE equivalent widths of saturated absorption lines are less sensitive to log g and [Fe/H] than their LTE values; and (iii) the solutions of the non-LTE problem for 6-level and 20-level model atoms are very close. For several giants, the lithium abundance has been redetermined by taking into account the departures from LTE.
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