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
Correct Answer:
Verified
Correct Answer:
Verified
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