The interpretation of cyclical photometric variations in certain dwarf ME-type stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Photometry, Dwarf Stars, Light Curve, M Stars, Stellar Atmospheres, Stellar Radiation, Coordinate Transformations, Curve Fitting, Eclipsing Binary Stars, Late Stars, Photosphere, Starspots, Stellar Models

Scientific paper

A method of determination of parameter sets characterizing models of starspots is described. The method makes use of a systematic integral notation in the description of the darkening due to spots and optimization procedures to evaluate appropriate parameters. The method is applied to light curves of YY Gem and CC Eri. In the latter case a comparison is made with the results of Bopp and Evans's (1973) study. The physical meaning of the derived parameter set and possibly correlated effects are considered for YY Gem.

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