Possibilities of the analysis of brightness distributions for the components of eclipsing variables from high-precision photometry data

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Abstract:

We carried out numerical experiments on the evaluation of the possibilities of obtaining information about the brightness distributions for the components of eclipsing variables from the high-precision photometry data expected to be obtained from the planned satellites COROT and Kepler. We examined a simple model of an eclipsing binary with spherical components on circular orbits and a linear law of limb darkening. The solutions of light curves have been obtained both by fitting a nonlinear model by a number of parameters including the limb-darkening coefficients and by solving the ill-posed inverse problem of restoration of brightness distributions across the discs of stars using a priori information about the form of these functions. The obtained estimates show that, if the observational accuracy is 10-4, then the limb-darkening coefficients can be found with a relative error of approximately 0.01. The brightness distributions across the discs of components can be restored to nearly the same accuracy as well.

Keywords: Brightness distributions; Eclipsing variables; Stars

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/10556790701306543

Affiliations: 1: Saratov State University, Saratov, Russia 2: Sternberg Astronomical Institute, Moscow, Russia

Publication date: February 1, 2007

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