Abstract
A method has been developed to determine the geometrical parameters of surface distributions of chemical elements on a spotted rotator from observations of variable line strengths. On the basis of simple assumptions for spot geometry and limb darkening this problem has been traced back to the same inverse problem as the determination of surface brightness parameters from photometric observations. The method was applied to eight He-peculiar (CP4) stars (HR 1441, HR 1890, HR 1932, HD 37776, HR 2509, HR 3089, HR 5387 and HR 7129) to derive the He surface distribution of these He-rich and He-weak stars from the line strength variation of the HeI λ 4026 line. The result and a discussion of the analysis is given.
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