The discovery of variable polarization over the 13.9 minute spin period of the intermediate polar RE 0751+14

The total (peak-to-peak) circular polarization variation over the 13.9 minute spin period of RE 0751+14 on 1992 October 26 was 4.2%±0.6% in the I band (830 nm) and 2.2%±0.3% in the R band (690 nm), with slightly stronger negative extremes and a faster transition from the negative to the positive values. The linear polarization reached about 2% in I and 0.8% in R. Our analysis suggests cyclotron emission from two extended regions near the opposite magnetic poles of the white dwarf, and a field strength B>5 MG (1 MG=10 6 G)