Overview of semi-sinusoidal stellar variability with the CoRoT satellite â&dagger; â&dagger;â&dagger

De Medeiros J.R.; Ferreira Lopes C.E.; Leao I.C.; Canto Martins B.L.; Catelan M.; Baglin A.; Vieira S.; Bravo J.P.; Cortes C.; De Freitas D.B.; Janot-Pacheco E.; Maciel S.C.; Melo C.H.F.; Osorio Y.; Porto De Mello G.F.; Valio A.

Overview of semi-sinusoidal stellar variability with the CoRoT satellite â&dagger; â&dagger;â&dagger

Tipo

Artigo de revisão

Data de publicação

2013

Periódico

Astronomy and Astrophysics

Citações (Scopus)

35

Autores

De Medeiros J.R.
Ferreira Lopes C.E.
Leao I.C.
Canto Martins B.L.
Catelan M.
Baglin A.
Vieira S.
Bravo J.P.
Cortes C.
De Freitas D.B.
Janot-Pacheco E.
Maciel S.C.
Melo C.H.F.
Osorio Y.
Porto De Mello G.F.
Valio A.

Resumo

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. © 2013 ESO.

Assuntos Scopus

Galactic Center , General-stars , Period distributions , Photometric , Stellar rotation , Techniques , Variables , Visual inspection