Rotation and Activity of F, G, and K type stars observed by CoRoT and KEPLER satellites
Stars, Activity, Rotation, Light Curves, Time series
The question of how typical the Sun is within the class of solar-type stars, in terms of activity and rotation has been the subject of active investigation over the past three decades. Recently, the CoRoT and Kepler space telescope observed Thousand of stars (163 thousands for CoRoT and 400 thousand for Kepler) with an unprecedented richness and precision providing an opportunity to study the rotation and variability of solar-type stars (F, G and K) based on light curves . Light curves of those solar-type stars often show fluctuations due to rotational modulation by magnetic features (starspots and faculae) on stellar surfaces, and this is also dependent of the magnetic cycle period. In this Thesis, we are presenting rotation period measurements of a large sample of field stars in the solar neighbourhood, observed by CoRoT and KEPLER satellites. Rotation periods was measured from an unified technique analysis composed by autocorrelation function, Lomb Scargle periodogram and wavelet. We also identified a sample of solar twins and analogs observed by the Kepler mission from which we determined their evolutionary status, rotation period and age from gyrochronology. For the rotation activity we used a proxy based on the light curve modulation. To interpret our results concerning the rotation measurements, based on solar physics, we compared the temporal variability of total solar irradiance (TSI) and the solar rotation period along a solar cycle. We used this interpretation with the variability of the CoRoT and Kepler light curves to undertand the connection of the structures responsible for the intrinsic evolution and the light curve modulation, as well as to determine the impact of the solar cycle on the measurements of the rotation period for F, G and K type stars.