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

question 50

Multiple Choice

Two stars have the same spectral classification,say,M2,but one of them is a red giant while the other is a main-sequence star.To determine which is which,we look at their spectra because (see Figure 10-9,Comins,Discovering the Essential Universe,6th ed.) the absorption lines in the giant will be:

• A) narrower because of the pressure difference between the atmospheres of the two stars.
• B) broader because of the pressure difference between the atmospheres of the two stars.
• 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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