In the Hertzsprung-Russell Diagram, How Does the Position of a Typical

question 191

Multiple Choice

In the Hertzsprung-Russell diagram, how does the position of a typical star change while it is at the main-sequence phase of its evolution?

• A) Stars move from upper right to lower left while they are on the main sequence.
• B) Stars move from upper left to lower right while they are on the main sequence.
• C) Massive stars (4 solar masses) move toward the upper left as their luminosity increases, while lower-mass stars move toward the lower right as their temperature decreases.
• D) A star's position on the main sequence is determined only by its mass, not its age, so stars do not move significantly along the main sequence during evolution.

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