Abundancias químicas y estado de evolución de estrellas tipo B y A

Abstract

Three stars of B (Alpha Tel and HR1781) and A (Tau7 Eri) type have been studied in order to determine their evolutionary state and the presence of chemical peculiarities. For this study we used spectra with high signal-to-noise ratios, obtained with the EBASIM spectrograph at CASLEO. The efective temperature, surface gravity, rotational velocity and chemical abundances were derived. In order to determine the evolutionary state of the stars, we calculate their luminosity using Hipparcos parallaxes.