Each choice below lists a spectral type and luminosity class for a star. Which one is a red supergiant?
A. spectral type M1, luminosity class V
B. spectral type O9, luminosity class I
C. spectral type G2, luminosity class V
D. spectral type M2, luminosity class I
Answer:D
Each choice below lists a spectral type and luminosity class for a star. Which one is a red supergiant?
A. spectral type M1, luminosity class V B. spectral type O9, luminosity class I C. spectral type G2, luminosity class V D. spectral type M2, luminosity class I