SIMBAD references

Context. During the past decade, several studies reported a correlation between chemical abundances of stars and condensation temperature (also known as T_c trend). However, the real astrophysical nature of this correlation is still debated.
Aims. The main goal of this work is to explore the possible dependence of the T_c trend on stellar Galactocentric distances, R_mean.
Methods. We used high-quality spectra of about 40 stars observed with the HARPS and UVES spectrographs to derive precise stellar parameters, chemical abundances, and stellar ages. A differential line-by-line analysis was applied to achieve the highest possible precision in the chemical abundances.
Results. We confirm previous results that [X/Fe] abundance ratios depend on stellar age and that for a given age, some elements also show a dependence on R_mean. When using the whole sample of stars, we observe a weak hint that the T_c trend depends on R_mean. The observed dependence is very complex and disappears when only stars with similar ages are considered.
Conclusions. To conclude on the possible dependence of the T_c trend on the formation place of stars, a larger sample of stars with very similar atmospheric parameters and stellar ages observed at different Galactocentric distances is needed.