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A diagram of the five stages of common envelope formation. In the first stage, neither object has filled its Roche lobe and the center of mass is closer to the more massive object. In the second stage, the more massive star begins to increase in size, and the center of mass of the binary is now inside the more massive star. In the third stage, the more massive star fills its Roche lobe.
A diagram of the five stages of common envelope formation, continued. In the fourth stage, matter moves from the more massive star into the Roche lobe of the less massive star. In the fifth stage, the two Roche lobes become connected.
Diagram of common envelope formation, the first stage of LMXB evolution. The black figure-eight represents the Roche lobes, the red object on the right (M1) represents the more-massive star, the orange object on the left (M2) represents the less-massive star, and CoM is the location of the binary's center of mass.