Whether the most luminous stars in the Pleiadescluster which are not on the main sequence are the protostars that are going to arrive on the main sequence or already left the main sequence star.

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Chapter 18, Problem 33Q

To determine

Whether the most luminous stars in the Pleiadescluster which are not on the main sequence are the protostars that are going to arrive on the main sequence or already left the main sequence star.

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