Spectropolarimetric Observations of the Recurrent Nova RS Oph

We report spectropolarimetric observations of the recurrent nova RS Oph obtained during four nights between July 2017 and July 2018. In the wavelength range from 5000 angstrom to 8000 angstrom, we find the maximum degree of linear polarization P-L, (obs) = (2.9 +/- 0.09)% at lambda approximate to 5600 angstrom and the position angle theta = 47.degrees 2 +/- 0.degrees 9. We do not detect any variability of the degree of polarization and the position angle. At the time of our observations, there is no intrinsic polarization in RS Oph and the observed values represent the interstellar polarization.