The Hydrogen Lines in Spectral Type a Stars

question 121

Multiple Choice

The hydrogen lines in spectral type A stars

• A)are most narrow for supergiants.
• B)are most narrow for main-sequence stars.
• C)can not be used to estimate the luminosity of the star.
• D)are very weak and difficult to see.
• E)are useful in determining the apparent magnitude of the star.

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