Abstract
Variable broad-band optical circular polarization of amplitude 0.001 percent in the rapidly rotating, upper main-sequence star Alpha Leo. The variability does not appear to correlate with the suggested range of the rotation period of the star (11-22 hr), but it does occur on short time scales. When compared to observations of the known magnetic star Alpha exp 2 CVn, the magnitude of the observed circular polarization indicates an effective magnetic field on the order of 1 kG is present. The circular polarization exhibits sign reversals which suggest a dipolar geometry to the field, a characteristic of the fields of magnetic Ap stars. 25 refs.
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