Abstract
In the framework of the direct photometric problem for spotted stars we obtained an analytic solution adopting gradually changing of the spot temperature from the center to the outskirts of the spots. The results are intended for the solution of the corresponding inverse problem that could give information for the mechanisms leading to spot creating.
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Kjurkchieva, D.P. Photometry of stars with nonhomogeneous temperature spots. Astrophys Space Sci 172, 255–262 (1990). https://doi.org/10.1007/BF00643317
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DOI: https://doi.org/10.1007/BF00643317