Lithium abundances in the atmospheres of SLR C--giants WZ Cas and WX Cyg from resonance and subordinate Li I lines

Abstract

Lithium abundances in the atmospheres of the super Li-rich C-giants WZ Cas and WX Cyg are derived by the spectral synthesis technique {\bf using} the Li I resonance line at λ670.8 nm and {\bf three subordinate} lines at λλ812.6, 610.4 and 497.2 nm. The differences between the Li abundances derived from the λ670.8 nm line and the λλ497.2, 812.6 nm lines do not exceed $\pm$ 0.5 dex. The lithium line at \la610.4 nm provides typically lower abundances than the resonance line (by $\approx$ 1 dex). The mean LTE and NLTE Li abundances from three Li I lines (excluding \la610.4 nm) are 4.7, 4.9 for WZ Cas, and 4.6, 4.8 for WX Cyg, respectively.