Determination of effective temperatures and [Fe/H] ratios of latespectral type stars from line depth ratio using TMCalc

The determination of effective temperatures and metallicity of late type stars with a highprecision is important in a related astrophysical study. The response of the lines with high and low exctitation potentials are different for varying temperature values (Gray ve Johanson, 1991). Thus, the line depth ratio method, namely, the ratio of equivalent widths are essential indicator of the effective temperature in this context. In addition, the line depth ratios is one of the methods used to determine the effective temperatures with a high precision. In this study, the equivalent widths of identified lines of 813 number of late type FGK stars are measured using high resolution (R~42000) and the high SN ratio (S/N ~100) ELODIE (Soubiran vd. 1998; Prugniel & Soubiran 2001) spectra by means of ARES (Automatic Routine for line Equivalent widths in stellar Spectra) code (Sousa vd. 2007). The corresponding effective temperatures and the metallicity values are calculated with high precision by TMCalc using line the depth ratio method and the measured equivalent widths of neighbouring line pairs with different excitation potentials for each of the stars Keywords: line depth ratio method, Late type stars, atmospheric parameters