Fig. 1.
Definition of the coordinate system and variables used in the calculation of MT. The coordinate system is centered in the donor star, with the x-axis defined as the line joining the donor and the accretor, with the accretor located at x = a where a is the orbital separation. The z-axis is oriented along the direction of the orbital angular momentum of the system, while the y-axis completes a standard right-handed oriented Cartesian set of coordinates. The Lagrangian point located behind the donor is either L3 or L2, depending on whether the donor is more or less massive than the accretor, respectively.
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