We determined monochromatic, bolometric and passband specific limb-darkening coefficients for illuminated atmospheres. Our results show that illuminated coefficients are significantly different from the non-illuminated ones and that illuminated atmospheres may present limb brightening instead of darkening, depending on the set of parameters chosen. We tested two different methods (Claret & Giménez 1990 and Van Hamme 1993) to calculate the coefficients and showed that in the illuminated case the method proposed by Van Hamme is recommended in order to obtain coefficients that preserve the total emergent flux from the atmosphere. For the passband specific coefficients we also present our results in a polynomial form, which is convenient for implementation of the use of these "illuminated'' coefficients in the analysis of eclipsing binary light curves.
AcknowledgementsSupport by FAPEMIG, CNPq, FINEP, CAPES (Brazilian institutions). Fruitful discussions with Dr. J.V. Clausen are gratefully acknowledged.
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