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staedtler staedtler
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7 years ago
What is the “turnoff” point for a star cluster?
A)   The point in the Hertzsprung-Russell diagram occupied by stars undergoing (or about to undergo) the helium flash
B)   The point in the Hertzsprung-Russell diagram occupied by the highest-mass main-sequence stars in the cluster
C)   The point in the Hertzsprung-Russell diagram occupied by the lowest-mass main-sequence stars in the cluster
D)   The point in the Hertzsprung-Russell diagram occupied by the highest-mass stars that have not yet reached the main sequence
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Discovering the Universe

Discovering the Universe


Edition: 7th
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hyponoticahyponotica
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7 years ago
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