On the metallicity dependance of the [Y/Mg] - age relation for solar type stars

TL;DR

This study investigates how the relationship between [Y/Mg] abundance ratio and stellar age varies with metallicity ([Fe/H]) in solar-type stars, revealing that the relation is metallicity-dependent and thus limited to Solar analogues.

Contribution

It demonstrates that the [Y/Mg]-age relation is not universal but depends on metallicity, challenging previous assumptions of its broad applicability.

Findings

The [Y/Mg]-age relation varies with [Fe/H] in solar neighborhood stars.

The relation is specific to Solar analogues and does not hold universally.

Metallicity influences the [Y/Mg]-age correlation, limiting its use as a universal age indicator.

Abstract

Several recent studies of Solar twins in the Solar neighbourhood have shown a tight correlation between various elemental abundances and age, in particular [Y/Mg]. If this relation is real and valid for other types of stars as well as elsewhere in the Galaxy it would provide a very powerful tool to derive ages of stars without the need to resort to determining their masses (evolutionary stage) very precisely. The method would also likely work if the stellar parameters have relatively large errors. The studies presented in the recent literature span a narrow range of [Fe/H]. By studying a larger sample of Solar neighbourhood dwarfs with a much larger range in [Fe/H], we find that the relation between [Y/Mg] and age depends on the [Fe/H] of the stars. Hence, it appears that the [Y/Mg] - age relation is unique to Solar analogues.