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Asteroseismological analysis of NY Vir suggests that at least the outer 55per cent of the star (in radius) rotates as a solid body and is tidallysynchronized to the orbit. Detailed calculation of tidal dissipation rates inNY Vir fails to account for this synchronization. Recent observations of Hecore burning stars suggest that the extent of the convective core may besubstantially larger than that predicted with theoretical models. We conduct aparametric investigation of sdB models generated with the Cambridge STARS codeto artificially extend the radial extent of the convective core. These modelswith extended cores still fail to account for the synchronization. Tidalsynchronization may be achievable with a non-MLT treatment of convection.

Convection physics and tidal synchronization of the subdwarf binary NY Virginis