Análise wavelet em curvas de luz de binárias eclipsantes da missão Kepler

Abstract

Binary stars form a great observational astronomy lab to the study of stellar variability and stellar evolution. This work describes the process taken to analyse binary systems from the Kepler Mission, KIC 8111622 e KIC 8197761, which have already been reported in literature. Both systems have variability besides the eclipses. The first system presents rotation and magnetic activity, with a rotation period of P = 6.41 days, the second one shows characteristics of a pulsating star of the type Doradus, indicating a pulsating period of P = 0.95 days. For those eclipsing binaries, were made the phase diagrams. The procedure wavelet has become increasingly interesting to the study of stellar variability, because it allows us to analyse data with such great details and identify distinct behaviour to the di erent phenomenons associated with the stars. Through this procedure, the local wavelet maps (understood as the energy distribution of the signal during the time) and the global spectra (temporal integration of the local map) were computed, in order to analyse the variability besides the eclipses and to determinate periodicities related with rotation and magnetic activity, as well as pulsation of these systems. The Morlet wavelet of 6th order was used to generate those maps, since this order provides a high resolution in time and frequency.