One Star in a Binary Will Almost Always Become a Red

question 9

Multiple Choice

One star in a binary will almost always become a red giant before the other because:

• A) one star is always larger in radius than the other
• B) binaries always have one star twice as massive as the other
• C) small differences in main-sequence masses yield large differences in main-sequence ages
• D) the more massive binary star always gets more mass from the less massive binary star when both are main-sequence stars
• E) one star always spins faster than the other

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