The Spectral Luminosity Class of the Star α Arae Is

question 14

Multiple Choice

The spectral luminosity class of the star α Arae is B2 V,and that of π Herculi is K3 II.Using only this information,without referring to tables or diagrams,we can tell that α Arae is:

• A) hotter but intrinsically fainter than π Herculi.
• B) hotter than π Herculi.
• C) cooler and intrinsically fainter than π Herculi.
• D) cooler than π Herculi.

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