Hydrogen lines are weak in the spectra of hot stars because many of the hydrogen atoms are ionized.

Name: Hydrogen lines are weak in the spectra of hot stars because many of the hydrogen atoms are ionized.
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As the temperature of a star increases, more and more hydrogen atoms get ionized, meaning that they lose their electrons. Ionized atoms do not produce spectral lines in the same way that neutral atoms do, so the hydrogen lines in the spectra of hot stars are weaker than those in cooler stars.

Hydrogen Lines Are Weak in the Spectra of Hot Stars