The size of a star which lies exactly above the Sun on the H-R diagram.

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Chapter 10, Problem 17QAP

To determine

The size of a star which lies exactly above the Sun on the H-R diagram.

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An O8 V star has an apparent visual magnitude of +5. Use the method of spectroscopic parallax to estimate the distance to the star (in pc). (Hints: Refer to one of the H–R diagrams in the chapter, and use the magnitude–distance formula, d = 10(mV − MV + 5)/5 where d is the distance in parsecs, mV and MV are the apparent and absolute visual magnitude respectively.)

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