Abstract
Abstract High-dispersion spectra in the near-infrared region of the F-type star Procyon (α CMi, F5 IV–V) were obtained and the absorption lines of eight light elements, including phosphorus P and potassium K were analyzed with ATLAS9 model atmospheres. The LTE abundance was found to be solar for N, Mg, Al, Si, and P, which is consistent with previous studies in the visible region. However, two CI lines, triplet lines of OI at λ7771–5 Å, and the resonance line of KI at λ7699 Å are fairly strong; their estimated LTE abundances are greater than the solar values by more than 0.2 dex. These discrepancies are discussed in terms of non-LTE line formation.
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