Abundance trend with condensation temperature for stars with different Galactic birth places

TL;DR

This study investigates how the chemical abundance condensation temperature trend in stars varies with their Galactic birthplaces, revealing complex dependencies influenced by stellar age and location.

Contribution

It provides a detailed analysis of the dependence of Tc trends on stellar Galactocentric distance and age, using high-precision spectroscopic data.

Findings

Abundance ratios depend on stellar age.

Some elements show dependence on Galactocentric distance at fixed age.

The Tc trend dependence on Rmean is weak and complex.

Abstract

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. The main goal of this work is to explore the possible dependence of the Tc trend on stellar Galactocentric distances, Rmean. 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. 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. 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