Exam-style question
Try this first
Which of the following statements about the Hertzsprung-Russell diagram is true?.
- A.All stars are found in the same region of the diagram.
- B.Main sequence stars are found along a diagonal band.
- C.The diagram does not relate to stellar temperature.
- D.Luminosity is irrelevant to stellar classification.
Model answer
What a good answer should say
- Main sequence stars are found along a diagonal band.
Explanation
Why this works
The evidence shows that main sequence stars occupy a diagonal band on the HR diagram, indicating a relationship between their luminosity and temperature. This implies that stars in this region are in a stable phase of hydrogen burning, leading to the conclusion that the HR diagram is essential for understanding stellar classifications.
Common mistake
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