Um estudo qualitativo e quantitativo da estrela HD 43587 baseado em dados da missão CoRoT e espectroscopia

Abstract

Among several aspects related to the Sun’s activity history, the extended period of the Sun’s evolution with a low chromospheric activity level and a low quantity of observed sunspots compared with other epochs, known as Maunder Minimum, remains as a puzzle for the stellar evolution theory. In this work we study HD 43587 a solar analog star that is a seismic primary target from the CoRoT mission and presents measurements of activity index along 50 yrs by the Mount Wilson program and outher spectroscopic measurements . Based on the similarity between HD 43587 with the Sun and by using observations collected by the CoRoT satellite as well as data from the literature, our preliminary analysis (Lithium abundance and chromosferic activity) confirms the evolutionary status of HD 43587. The CoRoT light curve indicates also a flat activity profile, that is a indicative of very low chromospheric activity. All this measurements and analysis make this star an excellent Maunder minimum candidate.