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We investigate the feasibility of the Si I infrared (IR) lines as Siabundance indicators for giant stars. We find that Si abundances obtained fromthe Si I IR lines based on the local thermodynamic equilibrium (LTE) analysisshow large line-to-line scatter (mean value of 0.13dex), and are higher thanthose from the optical lines. However, when the non-LTE effects are taken intoaccount, the line-to-line scatter reduces significantly (mean value of0.06dex), and the Si abundances are consistent with those from the opticallines. The typical average non-LTE correction of [Si/Fe] for our sample starsis about $-$0.35dex. Our results demonstrate that the Si I IR lines could bereliable abundance indicators provided that the non-LTE effects are properlytaken into account.

A non-LTE study of silicon abundances in giant stars from the Si I infrared lines in the zJ-band