In a binary system, the more massive stars always stay closer to the center of mass and moveslower.

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This is known as Kepler's Third Law and applies to all binary systems. The more massive star exerts a stronger gravitational pull, causing it to stay closer to the center of mass, while both stars move at the same speed in their orbit. This is known as Kepler's Third Law of Planetary Motion and applies to binary stars as well. The more massive star will have a smaller orbit and move slower around the center of mass, while the less massive star will have a larger orbit and move faster.

In a Binary System, the More Massive Stars Always Stay