The Solar Twin Planet Search III. The [Y/Mg] clock: estimating stellar ages of solar-type stars
M. Tucci Maia, I. Ram\'irez, J. Mel\'endez, M. Bedell, J. L. Bean, and, M. Asplund

TL;DR
This study demonstrates that the [Y/Mg] abundance ratio in solar twins correlates strongly with stellar age, enabling age estimates with approximately 0.8 Gyr precision across a broad age range.
Contribution
The paper provides high-precision measurements of Y and Mg abundances in 88 solar twins and confirms the [Y/Mg] ratio as a reliable stellar age indicator with improved accuracy.
Findings
[Y/Mg] ratio correlates strongly with age (slope -0.041 dex/Gyr).
The method achieves about 0.8 Gyr age precision for stars aged 0-10 Gyr.
Binary stars can be outliers due to mass transfer effects.
Abstract
Solar twins are stars with similar stellar (surface) parameters to the Sun that can have a wide range of ages. This provide an opportunity to analyze the variation of their chemical abundances with age. Nissen (2015) recently suggested that the abundances of the s-process element Y and the -element Mg could be used to estimate stellar ages. This paper aims to determine with high precision the Y, Mg, and Fe abundances for a sample of 88 solar twins that span a broad age range (\,Gyr) and investigate their use for estimating ages. We obtained high-quality Magellan Inamori Kyocera Echelle (MIKE) spectra and determined Y and Mg abundances using equivalent widths and a line-by-line differential method within a 1D LTE framework. Stellar parameters and iron abundances were measured in Paper I of this series for all stars, but a few (three) required a small revision. The…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astro and Planetary Science · Solar and Space Plasma Dynamics
