Hydrogen lines are weaker in both very hot and very cool stars.

Name: Hydrogen lines are weaker in both very hot and very cool stars.
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Hydrogen lines are strongest in stars with temperatures between 5,000K-7,000K. In very hot stars, the hydrogen atoms are fully ionized and there are no electrons available to absorb or emit photons, resulting in weaker lines. In very cool stars, the hydrogen atoms are not excited enough to emit or absorb photons, also resulting in weaker lines.

Hydrogen Lines Are Weaker in Both Very Hot and Very