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

Question

When a low mass star first runs short of hydrogen in its core, it becomes brighter because A) it explodes as a nova. B) Helium fusion gives off more energy than does hydrogen. C) Its outer, cooler layers are shed, and we see the brighter central core. D) The core contracts, raising the temperature and hydrogen burning shell outward. E) The helium flash increases the size of the star immensely. 2) Will the Sun become a brown dwarf? Explain. 3) Which of these does not depend on a close binary system to occur? A) A nova B) a Type I supernova C) a Type II supernova D) All of these need mass transfer to occur. E) None of these depend on mass transfer.

Explanation / Answer

1) the core contracts ,raising the temperature and hydrogen burning shell outward .

2) No, it is impossible for the sun to be a brown dwarf. Brown dwarfs are bodies that are too large to be planets, yet too small to be a star. The Sun is a fully-functioning star; it is hundreds of times larger than Jupiter. Brown dwarfs are only about 40 times larger than Jupiter.

3) All of these need mass transfer to occur .

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