Two Stars Have the Same Spectral Classification,say M2,but One Is

question 42

Multiple Choice

Two stars have the same spectral classification,say M2,but one is a red giant and the other is a main-sequence star.To determine which is which,we look at their spectra because the absorption lines in the giant will be

• A) narrower because of the pressure-broadening effect.
• B) broader because of the pressure-broadening effect.
• C) narrower because of the temperature difference between the two luminosity classes.
• D) broader because of the temperature difference between the two luminosity classes.

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