Concept explainers
Choose the best answer to each of the following. Explain your reasoning.
A white dwarf is (a) what most stars become when they die. (b) a slowly rotating neutron star. (c) a type of supernova.
The correct option for the meaning of a white dwarf.
Answer to Problem 1QQ
(a) What most stars become when they die.
Explanation of Solution
Introduction:
Stars have a lifecycle like any living specie. Stars are born in stellar nursery known as nebula. They grow and become a main-sequence star. Majority of their life is spent in the main sequence. Stars die and their fate depends on their mass.
An average mass star like sun becomes a red giant at the end of the main sequence stage and ultimately dies to become a white dwarf. Most of the stars have average mass and thus ultimately their core becomes a white dwarf after expelling majority of their mass. A white dwarf is a very dense core which contains electron-degenerate matter.
Thus, option (a) is correct.
A massive star goes supernova and becomes either a slowly rotating neutron star or a blackhole.
Thus, option (b) and (c) are incorrect.
Conclusion:
Thus, the correct option is (a).
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