As a White Dwarf Cools Its Radius Does Not Change

question 29

Multiple Choice

As a white dwarf cools its radius does not change because

• A) pressure due to nuclear reactions in a shell just below the surface keeps it from collapsing.
• B) pressure does not depend on temperature for a white dwarf because the electrons are degenerate.
• C) pressure does not depend on temperature because the white dwarf is too hot.
• D) pressure does not depend on temperature because the star has exhausted all its nuclear fuels.
• E) material accreting onto it from a companion maintains a constant radius.

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