Abundances determination of A, Am and F stars in the Pleiades and Coma Berenices clusters

TL;DR

This study measures chemical element abundances in A, Am, and F stars within the Pleiades and Coma Berenices clusters, highlighting the need for rotational mixing in models to match observations.

Contribution

It provides detailed abundance measurements for stars in two clusters and evaluates evolutionary models, emphasizing the importance of rotational mixing for accurate predictions.

Findings

Abundances of 18 elements were derived for 43 stars.

Current models do not fully match observed abundance patterns.

Rotational mixing is likely necessary to improve model accuracy.

Abstract

Abundances of 18 chemical elements have been derived for 27 A/Am and 16 F stars members of the Pleiades and Coma Berenices open clusters. We have specifically computed, with the Montr\'eal code, a series of evolutionary models for two A stars members of these two clusters. None of the models reproduces entirely the overall shape of the abundances patterns. The inclusion of competing processes such as rotational mixing in the radiative zones of these stars seems necessary to improve the agreement between observed and predicted abundances patterns.