Abstract
Using a model-independent technique, we have reconstructed a one-dimensional strip distribution of the brightness over a stellar disk from observations of microlensing of a Galactic bulge star by a caustic of the binary gravitational lens OGLE-1999-BUL-23, obtained by the international PLANET group. The ill-posed inverse problem was solved using a regularization method taking into account the non-negativity of the brightness distribution. The radial brightness distribution was searched for on a compact set of convex-upward, monotonically non-increasing, non-negative functions, assuming that the source is circularly symmetrical. The reconstructed brightness distribution is compared with the results of model fitting and limb-darkening calculations based on models of stellar atmospheres.
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Translated from Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Zhurnal, Vol. 79, No. 12, 2002, pp. 1102–1108.
Original Russian Text Copyright © 2002 by Bogdanov, Cherepashchuk.
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Bogdanov, M.B., Cherepashchuk, A.M. The brightness distribution over a stellar disk derived from observations of microlensing by a binary system. Astron. Rep. 46, 996–1001 (2002). https://doi.org/10.1134/1.1529257
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DOI: https://doi.org/10.1134/1.1529257