The spectral luminosity class of the star Spica is B1 V,and that of the starƮ Ceti is G8 V.From this information,we know thatƮ Ceti is _____ Spica.
A) cooler but has the same luminosity as
B) cooler and has a lower luminosity than
C) hotter but has the same luminosity as
D) hotter and has a lower luminosity than

Question

Quizplus · Accepted Answer

The spectral luminosity class indicates the temperature and luminosity of a star. Spica, with a B1 V luminosity class, is hotter and more luminous than τ Ceti, which has a G8 V luminosity class. Therefore, τ Ceti is cooler and has a lower luminosity than Spica.

The Spectral Luminosity Class of the Star Spica Is B1