INV SUPERIOR JUBILADO
MUZZIO Juan Carlos
congresos y reuniones científicas
Título:
Spatial structure of regular and chaotic orbits in a self-consistent triaxial stellar system
Autor/es:
J.C MUZZIO; D.D. CARPINTERO; F.C. WACHLIN
Lugar:
Cannes (Francia)
Reunión:
Workshop; 2004 Division on Dynamical Astronomy (American Astronomical Society) Meeting; 2004
Institución organizadora:
American Astronomical Society
Resumen:
We created a triaxial stellar system through the cold
disipationless collapse of 100,000 particles whose evolution was
followed with a multipolar code. Once an equilibrium system had
been obtained, the multipolar expansion was freezed and smoothed
in order to get a stationary smooth potential. The resulting model
was self-consistent and the orbits and Lyapunov exponents could
then be computed for a randomly selected sample of 3,472 of the bodies
that make up the system. More than half of the orbits (52.7%) turned
out to be chaotic. Regular orbits were then classified using
the frequency analysis automatic code of Carpintero and Aguilar (1998).
We present plots of the distributions of the different kinds of
orbits projected on the symmetry planes of the system. We distinguish
chaotic orbits with only one non-zero Lyapunov exponent from those
with two non-zero exponents and show that their spatial distributions
differ, that of the former being more similar to the one of the regular
orbits. Most of the regular orbits are boxes and boxlets, but the minor
axis tubes play an important role filling in the wasp waists of the
boxes and helping to give a lentil shape to the system. We see no
problem in building stable triaxial models with substantial amounts
of chaotic orbits; the difficulties found by other authors may be due
not to a physical cause but to a limitation of Schwarzschild´s method.