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physical object > natural object > celestial body > star > early star > B star > Bw star

Bw star comparison table

Subject	is a kind of	has definition
B star	early star	Blue-white star of spectral type B whose spectra are characterized by absorption lines of neutral helium which reach their maximum intensity at B2. The Balmer lines of hydrogen are strong, and lines of singly ionized oxygen and other gases are also present.
Bw star	B star	B star with weak helium lines - i.e., B stars which, if classified according to their colors, would have helium lines too weak for the classification, and which, if classified according to their helium lines, would have colors too blue for their spectral type.

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