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Consider a star with a parallax of 0.0073??, an apparent visual magnitude, V (= mV) of...

Consider a star with a parallax of 0.0073??, an apparent visual magnitude, V (= mV) of 10.4 mag and an absolute blue magnitude of MB = 5.8 mag. Assuming there is no extinction between us and it, determine the star’s: (a.) Distance. Report your answer in pc. (b.) Color index (B?V or MB ? MV). (c.) The Spectral Type and Luminosity class. Explain how you arrived at this answer.

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Answer #1

Luminosity class Description
Ia luminous supergiants
Iab intermediate-size luminous supergiants
Ib less luminous supergiants
II bright giants
III normal giants
IV subgiants
V main-sequence stars (dwarfs)
VI subdwarfs
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