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We present a deep circular polarization image of the Orion BN/KL nebula inthe Ks band and correlations of circular polarization, linear polarization, andH-Ks color representing extinction. The image of circular polarization clearlyreveals the quadrupolar structure around the massive star IRc2, rather than BN.H-Ks color is well correlated with circular polarization. A simple relationbetween dichroic extinction, color excess, circular and linear polarization isderived. The observed correlation between the Stokes parameters and the colorexcess agrees with the derived relation, and suggests a major contribution ofdichroic extinction to the production of circular polarization in this region,indicating the wide existence of aligned grains.

Near-Infrared Circular Polarimetry and Correlation Diagrams in the Orion BN/KL Region: Contribution of Dichroic Extinction