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physical object > natural object > celestial body > star > early star > B star > Bp star > helium-weak star

helium-weak star comparison table

Subject	is a kind of	has definition
Bp star	B star	Peculiar B stars whose spectra show a deficiency in helium and in which the lines of one or several elements are abnormally enhanced. Traditionally the most important subgroups are Si λ4200, Hg-Mn and Cr-Eu-Sr stars. The latest objects of the latter group correspond to early F-type.
helium-weak star	Bp star	B-type star in which the helium lines are weaker than in normal stars.

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