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

Pickering line (ionized helium Brackett line)
subject			fact

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

Kinds of Pickering line :

• Pi alpha (2 facts)
• Pi beta (2 facts)