LTE synthetic and observed profiles of Ca II IR triplet lines in photosphere and faculae

Abstract

A new NLTE photospheric and facular physical models are applied to calculate synthetic profiles of Ca II IR triplet lines (8498.023Å, 8542.091Å and 8662.141Å) in solar photosphere and faculae at angular distances 0.75 and 0.30 from the center of the solar disk. A reasonable congruency of calculated and observed contours of the lines is achieved in the wings and outer shoulders of the lines. Evident deviations are noted in the line cores. These results confirm the previous conclusions about the NLTE effects in the higher sub solar layers where the cores of the lines are formed, as indicated by the temperature curves of the electronic and excitation temperatures of our models. Values of Ca II abundance are deduced in the course of calculations, and compared with other values.