Chemical abundances of zeta Reticuli

Very recently, a strong Tc trend was reported for the zeta Reticuli binary system, which consists of two solar analogs. The observed trend in zeta^2^ Ret relative to its companion was explained by the presence of a debris disk around zeta^2^ Ret.

Our goal is to re-evaluate the presence and variability of the Tc trend in the zeta Reticuli system and to understand the impact of the presence of the debris disk on a star. We used very high-quality spectra of the two stars retrieved from the HARPS archive to derive very precise stellar parameters and chemical abundances. We derived the stellar parameters with the classical (nondifferential) method, while we applied a differential line-by-line analysis to achieve the highest possible precision in abundances, which are fundamental to explore for very tiny differences in the abundances between the stars.