In Which Region of the Hertzsprung-Russell Diagram Does a Newly

question 293

Multiple Choice

In which region of the Hertzsprung-Russell diagram does a newly formed protostar first appear when it begins to shine at visible wavelengths?

• A) the bottom right corner; very low luminosity because it is both small and cool
• B) the center of the main sequence since all protostars begin their lives at this position and move up or down it depending on their mass as time passes
• C) the right side; relatively large luminosity because of its size but cool
• D) the top left corner; at the top of the main sequence, down which it will progress with time

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