The star ɛ Canis Majoris has an absolute magnitude of -4.1 and a spectral class of B2.Using Figures 10-7 and 10-8 of Comins,Discovering the Essential Universe,6th ed.,how would Canis Majoris be classified?
A) B-type white dwarf
B) B2 III
C) B2 V
D) B2 I

Question

Quizplus · Accepted Answer

According to Figure 10-8 in Comins, a star with a spectral class of B2 falls under the category of "B-type main sequence stars" (labeled V). The absolute magnitude of -4.1 suggests that the star is very luminous, which matches the characteristics of ɛ Canis Majoris, a well-known blue giant star. Therefore, the best classification for this star is B2 V.

The Star ɛ Canis Majoris Has an Absolute Magnitude of -4.1