As a White Dwarf Evolves,the Direction of Its Motion on the Herzsprung-Russell

question 318

Multiple Choice

As a white dwarf evolves,the direction of its motion on the Herzsprung-Russell diagram is from upper left to lower right,which means that:

• A) its size or radius slowly increases as it cools until it ends up as a red giant star.
• B) its size or radius remains constant as it cools and becomes less luminous.
• C) it heats up as it shrinks because of the release of gravitational energy, ending up as a very hot but very small star.
• D) it shrinks as it cools, eventually becoming a cold, black hole in space.

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