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We have investigated the motion of the out-of-plane equilibrium points within the framework of the Elliptic Restricted Three-Body Problem (ER3BP) at JJ4 of the smaller primary in the field of stellar binary systems: XiBootis and Sirius around their common center of mass in elliptic orbits. The positions and stability of the out-of-plane equilibrium points are greatly affected on the premise of the oblateness at JJ4 of the smaller primary, semi-major axis and the eccentricity of their orbits. The positions LL6,7 of the infinitesimal body lie in the xxxx −plane almost directly above and below the center of each oblate primary. Numerically, we have computed the positions and stability of LL6,7 for the aforementioned binary systems and found that their positions are affected by the oblateness of the primaries, the semi-major axis and eccentricity of their orbits. It is observed that, for each set of values, there exist at least one complex root with positive real part and hence in Lyapunov sense, the stability of the out-of-plane equilibrium points are unstable.

The Motion of Out-of-Plane Equilibrium Points in the Elliptic Restricted Three-Body Problem at <i>J<sub>4</sub></i>