2006ApJ...651..475B

We have studied linear polarization in the RS CVn binary IM Pegasi in order to check the possibility that this star has variable polarization. For this purpose, accurate polarization measurements in the B, V, and R passbands with the new CCD polarimeter on the remotely operated KVA telescope at La Palma were carried out in 2005 August-November. Our observations have yielded accurate determination of the polarization in IM Peg: P_B=0.064%±0.004%, θ_B=97°±2°; P_V=0.102%±0.006%, θ_V=91°±3°; and P_R=0.078%±0.005%, θ_R=95°±4°. Analysis of the data indicates no significant polarization variability in IM Peg. The upper limit for the amplitude of possible variability is ≤0.03% in all passbands. In contrast to the previously published results, the linear polarization in this star is most likely nonvariable and interstellar in origin.