The hydrogen lines of spectral type A main sequence stars are ____.
A) the strongest
B) the weakest
C) the most narrow
D) useful in determining apparent magnitude
E) used to estimate the luminosity of the star

Question

Quizplus · Accepted Answer

The hydrogen lines of spectral type A main sequence stars are the strongest because these stars have the optimal temperature for hydrogen absorption, making these lines very prominent in their spectra.

The Hydrogen Lines of Spectral Type a Main Sequence Stars