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Why do o- and b-type stars have weaker hydrogen absorption lines than a-type stars?

Why do o- and b-type stars have weaker hydrogen absorption lines than a-type stars?
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Why do o- and b-type stars have weaker hydrogen absorption lines than a-type stars?

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User RoccoBerry
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Answer:

O- and B-type stars are cooler than A-type stars.

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User Vbroto
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