Fast nodal precession of the disc around Pleione requires a broken disc

Pleione is a Be star that in 218 day orbit with low-mass binary companion. Recent numerical simulations have shown disc can be subject to breaking when material actively being fed into the inner parts of disc. After breaking, composed two rings: an ring anchored stellar equator and outer free nodally precess. A double may explain some observed variability Pleione. We model nodal precession driven by companion on timescale $80.5\,\rm yr$. find broken eccentricity $e_{\rm b}= 0.6$ precess radius rough agreement size. An unbroken cannot fit both rate Suppression Kozai-Lidov more likely for high if extends tidal truncation radius.