Sun and HD 218209 abundance analysis

A systematic search employing lower excitation potentials, accurate log gf values, and an updated multiplet table led to the identification of 592 lines across 33 species (25 elements), including C, O, Mg (ionized), Al, P, S, Cu, Zr (neutral), and La. To determine the uncertainties in loggf values, we assessed solar abundance using a very high-resolution (R~1000000) disk-integrated solar spectrum.

These lines were confirmed to be blend-free in the solar spectrum. The line list was further validated by analyzing the metal-poor star HD,218209 (G6V), which is notable for its well-documented and reliable abundance in literature. The abundances were obtained using the equivalent width (EW) method and further refined by applying the spectrum synthesis method.