The effect of rotation on the abundances of the chemical elements of the A-type stars in the Praesepe cluster

TL;DR

This study investigates how rotation influences chemical element abundances in A-type stars within the Praesepe cluster, revealing correlations between stellar rotation speed and chemical peculiarities.

Contribution

It provides the first detailed chemical abundance analysis of Praesepe A- and F-type stars, highlighting the relationship between rotation velocity and chemical peculiarities in Am stars.

Findings

Strong correlation between Am star peculiarity and Vsini.

Underabundant elements increase with Vsini in Am stars.

Abundances of various elements correlate with iron abundance.

Abstract

We study how chemical abundances of late B-, A- and early F-type stars evolve with time, and we search for correlations between the abundance of chemical elements and other stellar parameters, such as effective temperature and Vsini. We have observed a large number of B-, A- and F-type stars belonging to open clusters of different ages. In this paper we concentrate on the Praesepe cluster (log t = 8.85), for which we have obtained high resolution, high signal-to-noise ratio spectra of sixteen normal A- and F-type stars and one Am star, using the SOPHIE spectrograph of the Observatoire de Haute-Provence. For all the observed stars, we have derived fundamental parameters and chemical abundances. In addition, we discuss another eight Am stars belonging to the same cluster, for which the abundance analysis had been presented in a previous paper. We find a strong correlation between peculiarity of Am stars and Vsini. The abundance of the elements underabundant in Am stars increases with Vsini, while it decreases for the overabundant elements. Chemical abundances of various elements appear correlated with the iron abundance.