Abstract
Context. To date, the CoRoT space mission has produced more than 124 471
light curves. Classifying these curves in terms of unambiguous
variability behavior is mandatory for obtaining an unbiased statistical
view on their controlling root-causes.
Aims. The present study provides an overview of semi-sinusoidal light
curves observed by the CoRoT exo-field CCDs.
Methods. We selected a sample of 4206 light curves presenting
well-defined semi-sinusoidal signatures. The variability periods were
computed based on Lomb-Scargle periodograms, harmonic fits, and visual
inspection.
Results. Color-period diagrams for the present sample show the trend of
an increase of the variability periods as long as the stars evolve. This
evolutionary behavior is also noticed when comparing the period
distribution in the Galactic center and anti-center directions. These
aspects indicate a compatibility with stellar rotation, although more
information is needed to confirm their root-causes. Considering this
possibility, we identified a subset of three Sun-like candidates by
their photometric period. Finally, the variability period versus color
diagram behavior was found to be highly dependent on the reddening
correction.
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