In the Context of Binary Star Formation
First, contract slowly down the sequence of Maclaurin spheroids to the
point of dynamical instability (D), then evolve along the
Riemann (x = +1) sequence of ellipsoids until a bifurcation to the dumbbell
sequence is encountered.
Then, contract slowly along the dumbbell sequence (if one exists!) until
the configuration "pinches off" into a binary system.