摘要：Context. During the past decade, several studies reported a correlation
between chemical abundances of stars and condensation temperature (also known as
Tc 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 Tc trend on stellar Galactocentric
distances, Rmean.
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
Rmean. When using the whole sample of
stars, we observe a weak hint that the Tc trend depends on Rmean. 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
Tc 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.
