Abstract
This paper presents an extension of the method of the characteristic points by Kjurkchieva (1987, 1989). This method for the analysis of light curves of spotted stars is further developed by including spectral information. Expressions describing the variation of the rotation broadening of spectral features arising from a star spot are derived for a known spot configuration. The results are used in the solution of the inverse problem by the method of the characteristic points. It is shown that the rotation broadening of spectral features from star spots can be used to easily determine the angular size and the polar distance of a circular spot. It turns out that the equatorial velocity and radius of the spotted star can be obtained in some cases by the combined analysis of the photometric and spectral data.
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Kjurkchieva, D.P. Rotation broadening of spectral features from star spots. Astrophys Space Sci 232, 185–194 (1995). https://doi.org/10.1007/BF00627553
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DOI: https://doi.org/10.1007/BF00627553