The Star P Cygni (In the Constellation Cygnus, the Swan)

question 109

Multiple Choice

The star P Cygni (in the constellation Cygnus, the Swan) is surrounded by an extensive low-density atmosphere. It has a bright, continuous spectrum with many narrow, dark absorption lines and a few bright emission lines. The bright emission lines are produced by

• A) the low-density atmosphere of the star emitting light in all directions.
• B) only the part of the low-density atmosphere that is between Earth and the surface of the star.
• C) all parts of the star, the stellar surface, and the atmosphere, equally.
• D) the hot, dense, opaque gas at or near the star's surface.

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