How Is a Luminosity Class Assigned to a Star

question 71

Multiple Choice

How is a luminosity class assigned to a star

• A)by combining the apparent magnitude with the star's parallax
• B)by measuring the period of variability in the star's apparent magnitude
• C)by studying the absorption line width in the spectrum of the star
• D)by observing the angular size of the star's image in a photograph or digital image

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