One star has a spectral-luminosity class of B5 V (main sequence) and the other has a spectral-luminosity class of B5 Ia (supergiant) . What difference do we see in the spectra of these two stars and why?
A) The main sequence star has broader hydrogen absorption lines, because its atmosphere is hotter than that of the supergiant.
B) The main sequence star has narrower hydrogen absorption lines, because its atmosphere is cooler than that of the supergiant.
C) The main sequence star has broader hydrogen absorption lines, because its atmosphere is denser and at higher pressure than that of the supergiant.
D) The main sequence star has narrower hydrogen absorption lines, because its atmosphere is more compact (less physically extended) than that of the supergiant.
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