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In close binary systems the atmosphere of one or both components can besignificantly influenced by irradiation from the companion. Often theirradiated atmosphere is simulated with a single-temperature approximation forthe entire half-sphere. We present a scheme to take the varying irradiationangle into account by combining several separate 1D models. This is independentof the actual code which provides the separate stellar spectra. We calculatethe projected area of zones with given irradiation angle and use thisgeometrical factor to scale separate 1D models. As an example we calculate twodifferent irradiation scenarios with the PHOENIX code. The scheme to calculatethe projected area is applicable independent of the physical mechanism thatforms these zones. In the case of irradiation by a primary with T=125000 K, thesecondary forms ions at different ionisation states for different irradiationangles. No single irradiation angle exists which provides an accuratedescription of the spectrum. We show a similar simulation for weakerirradiation, where the profile of the H$\alpha$ line depends on the irradiationangle.

A method to simulate inhomogeneously irradiated objects with a superposition of 1D models