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SIIA Público
SISTEMA INTEGRAL DE INFORMACIÓN ACADÉMICA - PÚBLICO
Título del libro: Living Together: Planets, Host Stars, And Binaries Título del capítulo: Asynchonous Binaries, Energy Dissipation and Turbulent Viscosity
Stars in binary systems are generally modeled under the assumption that
they are in an equilibrium configuration and, in particular, that the
stellar rotation angular velocity equals the orbital angular velocity.
However, asynchronous rotation is more common than generally recognized.
All eccentric systems undergo asynchronous rotation and the angular
velocity of rotation of many stars in circular orbits differs from that
of the orbital angular velocity. Combined with the external
gravitational potential, this asynchronous rotation causes shearing
motions in the stellar layers and, given that the stellar material is
not inviscid, kinetic energy is dissipated into heat. In 1968, Zdenek
Kopal addressed the question of whether the tidal shear energy
dissipation rates, E, in asynchronous binaries can lead to an internal
stellar structure that differs from that in an analogous single star.
His calculation, based on the assumption that the viscosity is purely
molecular, led him to conclude that E is insignificant and therefore has
no effect on the internal stellar structure. However, Kopal also pointed
out the important caveat that if turbulent viscosity prevailed, then
larger values of (E)over dot would obtain. We have revisited the
question of the magnitude of E using the TIDES code (Moreno 2011) and
examined its dependence on viscosity for several layers of a ZAMS 30
M-circle dot star with a 20 M-circle dot companion in a 6 -day eccentric
orbit. We find that conditions for turbulent viscosity are favored when
the star expands after leaving the main sequence. For example, when the
30 M-circle dot star is 5 Myr old and rotating near its corrotation
speed, turbulent viscosity might be expected to appear in all layers at
distances greater than 60% of the maximum stellar radius. As a
consequence, tidal shear energy dissipation may constitute a non
-negligible effect in a large number of close binary systems, with
possibly interesting consequences for their internal structure and
evolution.