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Paper: Numerical Improvements in the Treatment of Irradiated Atmospheres in Close Binary Systems
Volume: 333, Tidal Evolution and Oscillations in Binary Stars: Third Granada Workshop on Stellar Structure
Page: 270
Authors: Claret, A.
Abstract: The irradiation of cool stellar atmospheres is reanalyzed using a modified version of the UMA (Uppsala Model Atmosphere) code which incorporates two improvements concerning 1) the spatial resolution (18 μ points instead of only 6 adopted previously) and 2) the adoption of modern atmosphere models to simulate hot companions. The implementation of a better spacial resolution is shown to be essential to describe with better accuracy the center to limb variation of the specific intensities. It is also shown that only by adopting such a resolution (or a higher one) it is possible to detect and quantify the limb-brightening with confidence. As in the case of standard (non-irradiated) plane-parallel models, the Least-Squares Method (LSM) applied to the series expansion for the specific intensity introduced by Claret (2000) is shown to be the best procedure to derive the limb-darkening coefficients for illuminated atmospheres producing very small scattering and conserving the flux accurately.
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