Of Two Stars of Spectral Class B5,one Has Broad Hydrogen

question 4

Multiple Choice

Of two stars of spectral class B5,one has broad hydrogen lines and the other has narrow hydrogen lines.How do these stars differ physically?

• A) The star with the narrow lines is a main-sequence star,and the star with the broad lines is a giant or supergiant.
• B) The star with the narrow lines is a hot star,and the star with the broad lines is a cool star.
• C) The star with the narrow lines is a giant or supergiant,and the star with the broad lines is a main-sequence star.
• D) The star with the narrow lines is a cool star,and the star with the broad lines is a hot star.

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