Collisionless analogs of Riemann S ellipsoids with halo

A spheroidal halo ensures equilibrium of the collisionless analogs of the Riemann S ellipsoids with oscillations of the particles along the direction of their rotation. Sequences of collisionless triaxial ellipsoids begin and end with dynamically stable members of collisionless embedded spheroids. Both 'liquid' and collisionless Riemann S ellipsoids with weak halo have properties that resemble those of bars of SB galaxies.