The strongest lines present in spectral class A stars are absorption lines of
A) oxygen.
B) iron.
C) complex molecules.
D) helium.
E) hydrogen.

Question

Quizplus · Accepted Answer

The strongest lines present in spectral class A stars are absorption lines of hydrogen. This is because A-type stars have surface temperatures that allow hydrogen to be the dominant element in their spectra, producing strong Balmer lines.

The Strongest Lines Present in Spectral Class a Stars Are