The Ap Si star HD 133880 is found to have a very nonsinusoidal magnetic field curve. It is argued that this star is one of a very small number of Ap stars that have predominantly nondipolar field geometries. One possible family of models that reproduces the observed magnetic curve may be found using a collinear dipole and quadrupole; these models suggest that the quadrupolar field component is at least 1.3 times larger than the dipolar component.
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J. D. Landstreet (1990) studied this question.
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