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Title: Overview of semi-sinusoidal stellar variability with the CoRoT satellite
Authors: Medeiros, José Renan de
Lopes, C. E. Ferreira
Leão, Izan de Castro
Martins, Bruno Leonardo Canto
Catelan, M.
Baglin, A.
Vieira, S.
Bravo, J. P.
Cortés, C.
Freitas, D. B. de
Janot-Pacheco, E.
Maciel, S. C.
Melo, C. H. F.
Osorio, Y.
Mello, G. F. Porto de
Valio, A.
Keywords: Stars: variables: general;Stars: rotation;Techniques: photometric
Issue Date: 2013
Publisher: Astronomy & Astrophysics
Citation: MEDEIROS, José Renan de et al. Overview of semi-sinusoidal stellar variability with the CoRoT satellite. Astronomy & Astrophysics (Berlin. Print), v. 555, p. A63, 2013. ISSN 1432-0746 versão online. DOI Disponível em: Acesso em: 19 Maio 2020. Reproduzido com a permissão de Astronomy & Astrophysics, © ESO. Reproduzido com permissão da Astronomy & Astrophysics, © ESO.
Portuguese 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 rootcauses. 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.
ISSN: 0004-6361 (print), 1432-0746 (online)
Appears in Collections:CCET - DFTE - Artigos publicados em periódicos

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