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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > absorption line > interstellar line > HK line

HK line
subject			fact

HK line	is a kind of interstellar line
interstellar line	has width narrow
	has detection procedure narrow absorption lines which don't participate in the periodic Doppler shift of intrinsic absorption lines in a binary star
	has equivalent width depends on the amount of absorbing matter between the source and the observer
	occurs in O stars
absorption line	has antonym emission line
spectral line	has transition
spectral feature	has wavelength
	has species
radiation measurement	has unit radiation unit
number	has value