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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Definitions:

Defense Mechanism

Psychological strategies brought into play by individuals to cope with reality and to maintain self-image.

Displacement

A psychological defense mechanism where an individual shifts feelings from an undesirable situation to one that is more acceptable.

Yelled

To have shouted or expressed something loudly, often due to strong emotions.

Displacement

In psychology, it is a defense mechanism where the mind substitutes either a new aim or a new object for goals felt in their original form to be dangerous or unacceptable.