How Do Two Unequal-Mass Stars in a Binary Star System

question 106

Multiple Choice

How do two unequal-mass stars in a binary star system move around each other, in general?

• A) The stars move in a single circular orbit around the same center and always on opposite sides from each other.
• B) The stars move in straight lines, back and forth past each other.
• C) The low-mass star moves in a circular orbit around the high-mass star, which remains stationary.
• D) The stars move in elliptical orbits about a common center of mass.

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