Abstract
In the paper, we calculate the absorbed flux of the mutual irradiation of the components in detached binary systems, and obtain the surface temperature distribution on the components. The maximum temperature difference over the surface is a measure of the deviation between isothermal and equipotential surfaces. For 33 late-type binary systems with known elements, we evaluate this maximum difference. The result shows that the isothermal-equipotential deviation is always larger in the cooler than in the hotter components. This result supports Zhou and Leung's idea that the large difference between “star-spots” and sunspots is due to cyclones and anticyclones. The effect of limb darkening (amounting to over 18% and always larger in the hotter component) is included in the consideration.
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