Estudo espectroscópico e determinação de abundâncias químicas em estrelas eruptivas e não eruptivas do aglomerado aberto das Híades

Abstract

The study of stars in open clusters offers the possibility of rigorously controlling stellar characteristics, as each cluster represents a homogeneous group of stars that formed at the same time and under the same conditions. These properties favor the study of exoplanets, especially with regard to the influence of the stellar environment on planetary formation. It is worth noting that stellar magnetic fields can give rise to extremely energetic events called stellar flares, which influence the environment around the star and the atmospheric conditions of nearby planets. In this work, the main objective is to determine the stellar atmospheric parameters, such as effective temperature, microturbulence velocity, surface gravity, metallicity, and chemical abundances, in a sample of flaring and non-flaring stars belonging to the Hyades open cluster through spectral synthesis. Regarding the obtained atmospheric parameters, our results show excellent agreement with literature values. However, for the metallicity of the stars in our sample, there is some discrepancy with the literature values, indicating the need for further investigation into the causes of this difference. The analysis of chemical abundances as a function of atomic number did not allow solid conclusions about the influence of stellar flares due to the limitation in the number of stars in the sample. Future perspectives include expanding the sample of stars in this cluster, as well as in other open clusters. We also plan to determine the rotational velocity and expand the analysis of spectral lines into the infrared using other high-resolution spectrographs such as UVES, NIRPS, and ESPRESSO. In this way, we aim to obtain more refined and statistically significant observational constraints, contributing to future studies of stellar astrophysics and exoplanetology.