Convection physics and tidal synchronization of the subdwarf binary NY Virginis. (arXiv:1903.06176v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Preece_H/0/1/0/all/0/1">Holly P. Preece</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tout_C/0/1/0/all/0/1">Christopher A. Tout</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Jeffery_C/0/1/0/all/0/1">C. Simon Jeffery</a>
Asteroseismological analysis of NY Vir suggests that at least the outer 55
per cent of the star (in radius) rotates as a solid body and is tidally
synchronized to the orbit. Detailed calculation of tidal dissipation rates in
NY Vir fails to account for this synchronization. Recent observations of He
core burning stars suggest that the extent of the convective core may be
substantially larger than that predicted with theoretical models. We conduct a
parametric investigation of sdB models generated with the Cambridge STARS code
to artificially extend the radial extent of the convective core. These models
with extended cores still fail to account for the synchronization. Tidal
synchronization may be achievable with a non-MLT treatment of convection.
Asteroseismological analysis of NY Vir suggests that at least the outer 55
per cent of the star (in radius) rotates as a solid body and is tidally
synchronized to the orbit. Detailed calculation of tidal dissipation rates in
NY Vir fails to account for this synchronization. Recent observations of He
core burning stars suggest that the extent of the convective core may be
substantially larger than that predicted with theoretical models. We conduct a
parametric investigation of sdB models generated with the Cambridge STARS code
to artificially extend the radial extent of the convective core. These models
with extended cores still fail to account for the synchronization. Tidal
synchronization may be achievable with a non-MLT treatment of convection.
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