In the H-R Diagram Shown in Figure 13-31b in the Text

question 77

Multiple Choice

In the H-R diagram shown in Figure 13-31b in the text, the brightest stars in the Pleiades cluster are not on the main sequence but away from it toward the upper right. Explain.

• A) The brightest stars have not yet reached the main sequence and are in the T Tauri phase.
• B) The brightest stars have already evolved through the red giant phase and have now returned to the blue giant phase on their way to the white dwarf phase.
• C) The brightest stars have already become white dwarf stars, as shown by their position.
• D) These blue supergiant stars have already begun to evolve toward the red supergiant phase.

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