The synthetic spectra of MgH lines was computed for the grid of the model atmospheres and compared with observed spectrum of Arcturus .
The parameters of the atmosphere of Arcturus \log { g } = 1.5 for T _ { eff } = 4300 K were found by using the minimization procedure of differences between observed and computed spectra and compared with results of other studies . Key words : stars : atmospheres , stars : fundamental parameters , stars : individual ( Arcturus ) , line : profiles .