| 1. | As the cluster ages, the turn-off moves progressively down the main sequence.
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| 2. | It is classified as B7 main sequence star with a mass of.
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| 3. | They then move across from the main sequence into the giant branch.
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| 4. | This is an F-type main sequence star with a stellar classification of.
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| 5. | O-type stars represent the highest masses of stars on the main sequence.
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| 6. | Both components of the binary star are a white main sequence dwarfs.
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| 7. | The less massive member is an O8 main sequence star of approximately.
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| 8. | Stars less than about have not yet reached the main sequence.
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| 9. | When red dwarf leave its main sequence will it become a red giant?
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| 10. | The more massive member of the pair is an O3.5 main sequence star.
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