Tidal damping would make orbits circular
But buffeting from the quadrupole moments induced by convection, causes a finite eccentricity
Analogous to pendulum buffeting in air
Eccentricity is ``frozen'' when mass transfer ceases
Figure 47: Solid line -- the predicted median eccentricity for pulsars recycled by stable mass transfer from a Roche-lobe-filling, low-mass red giant. Dotted lines -- 95 per cent of the measured eccentricities for recycled pulsars are expected to lie within these [29, 30]. Circles -- low-mass binary pulsars. Squares - upper limits on measured eccentricities. Crosses - high-mass binary pulsars. Triangles - intermediate-mass binary pulsars. Dashed lines - approximate limits obtainable on eccentricities for timing residuals of s and s.