Departamento de FísicaUniversidade Federal do Rio Grande do
2 Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile
3 The Milky Way Millennium Nucleus, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile
4 LESIA, UMR 8109 CNRS, Observatoire de Paris, UVSQ, Université Paris-Diderot, 5 place J. Janssen, 92195 Meudon, France
5 Departamento de Física, Facultad de Ciencias Básicas, Universidad Metropolitana de la Educacion, Av. José Pedro Alessandri 774, 7760197 Ñuñoa, Santiago, Chile
6 Universidade de São Paulo/IAG-USP, rua do Matão, 1226, Cidade Universitária, 05508-900 São Paulo, SP, Brazil
7 IFPB – Instituto Federal de Educação, Ciência e Tecnologia da Paraíba, Av. Primeiro de Maio 720, 58015-430 João Pessoa, PB, Brazil
8 European Southern Observatory, Casilla 19001, Santiago, Chile
9 Department of Physics and Astronomy Uppsala University, Box 516, 751 20 Uppsala, Sweden
10 Universidade Federal do Rio de Janeiro, Observatório do Valongo, Ladeira do Pedro Antonio, 43, 20080-090 Rio de Janeiro, Brazil
11 Center for Radio Astronomy and Astrophysics Mackenzie, Universidade Presbiteriana Mackenzie, Rua da Consolação, 896 São Paulo, SP, Brazil
Received: 13 April 2012
Accepted: 24 April 2013
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.
Key words: stars: variables: general / stars: rotation / techniques: photometric
The CoRoT space mission was developed and is operated by the French space agency CNES, with the participation of ESA’s RSSD and Science Programmes, Austria, Belgium, Brazil, Germany, and Spain.
Table 2 is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (188.8.131.52) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/555/A63
© ESO, 2013