Um estudo da rotação de sistemas binários e sua relação com os parâmetros estelares e orbitais

Abstract

Stellar rotation is an important parameter to be considered in the study of stellar evolution and structure, as it relates to several equally relevant parameters such as mass and temperature and influences the chemical composition of the star. In binary systems the study of rotation allows us to understand the tidal effects that a system can suffer and the process that makes the system achieve synchronization and circularization. To understand how rotation behaves and relates to other stellar parameters in binary systems, we apply an original method to extract and analyze the rotation periods in light curves of the CoRoT and TESS space missions of stars belonging to eclipsing and spectroscopic binary systems. In addition, we analyzed the relationships between other parameters such as orbital period and eccentricity, projected rotational velocity and effective temperature in order to analyze the effects of tidal interactions on these systems and understand the relationships of rotation with each of these parameters. We finished this study with correlation diagrams to have an overview of different groups of binaries gathered in this work. We obtained excellent results in determining the rotation period for 70 eclipsing binary systems, 26 spectroscopic binary systems and 15 systems belonging to the Taurus-Auriga region. We confirm the values of the eccentricities for 18 eclipsing binary systems and found 39 synchronized systems of which 12 are synchronized and circularized. For the spectroscopic systems, we found that for the stars of the main sequence, the shorter the orbital period, the greater the probability of the system being synchronized, however, it is possible to find red giants of long period synchronized. We also found that the correlations between rotation, orbital parameters, mass and temperature change according to the different types of binary systems.