When a Low Mass Star First Runs Short of Hydrogen

question 93

Multiple Choice

When a low mass star first runs short of hydrogen in its core, it becomes brighter because

• A) its outer, cooler layers are shed, and we see the brighter central core.
• B) the helium flash increases the size of the star immensely.
• C) the core contracts, raising the temperature and extending the hydrogen burning shell outward.
• D) it explodes as a nova.
• E) helium fusion gives off more energy than does hydrogen.

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