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

question 159

Multiple Choice

The star ɛ Canis Majoris has an absolute magnitude of -4.1 and a spectral luminosity class of B2 V.The star ϒ Crucis has a spectral class of M4 and the same absolute magnitude as ɛ Canis Majoris.Using Figure 10-10 of Comins,Discovering the Essential Universe,6th ed.,the spectral luminosity class ofϒ Crucis is probably:

• A) M-type white dwarf.
• B) M4 III.
• C) M4 I.
• D) M4 V.

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