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Absorption lines of the 12CO and 13CO molecular bands (Delta v = 2) at 2.29-- 2.45 micron are modelled in spectrum of Arcturus (K2III). We compute a gridof model atmospheres and synthetic spectra for giant of Teff = 4300, log g =1.5, and the elemental abundances of Peterson et al. (1993), but abundances ofcarbon, oxygen and the carbon isotopic ratio 12C/13C are varied in ourcomputations. The computed spectra are fitted to the observed spectrum ofArcturus from the atlas of Hinkle et al. (1995). The best fit to observedspectrum is achieved for log N(C) = -3.78 +/- 0.1, 12C/13C = 8 +/- 1. Adependence of the determined 12C/13C vs. log N(C) and log N(O) in atmospheresof red giants is discussed.

The Carbon Abundance and 12C/13C Isotopic Ratio in the Atmosphere of Arcturus from 2.3 micron CO Bands