Two Stars Both Have Parallaxes of 0

question 5

Multiple Choice

Two stars both have parallaxes of 0.023", but star A has apparent magnitude +2.3, while star B is magnitude +7.3. Which statement is true?

• A) Star A is both 100× brighter and larger than star B.
• B) Star B must be ten times more luminous.
• C) Star A must be ten times closer.
• D) Star A is both 100× brighter and more luminous than star B.
• E) Nothing, since we do not know their absolute magnitudes.

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