Question

Look again at the Orion constellation. With
one exception, all the stars that make up
the constellation are bright, young blue
giant or supergiant stars. The exception is
Betelgeuse, one of the brightest stars in the
night sky. Betelgeuse is a red giant star
located at Orion’s left shoulder. Explain how
the stellar spectrum of Betelgeuse would be
different than the spectra of the other stars
in Orion. Include information what elements
might be represented in the spectral lines.