By What Standard Technique Do Astronomers Find the Luminosity Class

question 94

Multiple Choice

By what standard technique do astronomers find the luminosity class (I,II,III,IV,or V) of a star?

• A) combining the apparent magnitude with the measured distance to the star
• B) observing the diameter of the star on a photographic plate or CCD image
• C) timing how long it takes for the star to be eclipsed by a companion in an eclipsing binary star system
• D) studying the absorption lines in the star's spectrum

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