Sirius is a star with spectral type A and Rigel is a star with spectral type B. What can we conclude?

Question

Quizplus · Accepted Answer

The spectral type of a star is directly related to its surface temperature. Spectral type A stars have temperatures between 7,500 K and 10,000 K, while spectral type B stars have temperatures between 10,000 K and 30,000 K. Therefore, Rigel, which has spectral type B, has a higher surface temperature than Sirius, which has spectral type A.

Sirius Is a Star with Spectral Type a and Rigel