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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > ionized helium line > Pickering line > Pi alpha

Pi alpha
subject			fact

Pi alpha	has wavelength 10124 Å
	is an instance of Pickering line
Pickering line	has synonym ionized helium Brackett line
	has series limit 3644 Å
	has lower energy level 4
	occurs in O star
ionized helium line	has species ionized helium (He II)
spectral line	has transition
	has equivalent width
spectral feature	has width
radiation measurement	has unit radiation unit
number	has value