Presentation 1 : Oral
Viscosity driven bar mode instability in rapidly
rotating neutron stars and strange stars
Gondek-Rosinska Dorota, Gourgoulhon Eric
The laser interferometric gravitational wave detectors should be fully
operationally soon. Triaxial instabilities of rotating neutron stars
can play an important role as an emission mechanism of gravitational
waves in the frequency range of forthcoming LIGO/VIRGO interferometric
detectors. We study the secular triaxial instability of rigidly
rotating neutron stars and strange stars in general relativity. At the
Newtonian limit, this corresponds to the bifurcation point between the
Maclaurin spheroid and the Jacobi ellipsoids. We find that
stabilizating effect of relativity in the case of homogeneous fluid
bodies is much weaker than showed by Shapiro \& Zane (1998)
post-Newtonian calculations. In the case of strange stars we find
that the bar mode instability is possible for a broad ranges of
gravitational masses and rotational frequencies.