DQ Herculis: Periodic Linear Polarization Synchronous with the Rapid Light Variations

Abstract

Linear-polarization variations synchronized with the 7t' light variations have been found in DQ Her. As with the circular polarization, the fundamental period is l42 , twice the light period. The largest amplitude is in the ultraviolet, wherein AQ, AU 0.6 percent. A model is presented. Subject headings: binaries - magnetic fields - polarization