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

interstellar line
subject			fact

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
	has definition Sharp, distinct absorption lines superposed on stellar spectra, produced by the interstellar gas located between the source and the observer. Strongest are the D lines, followed by the H and K lines, and the K I doublet at 7699 and 7644 Å.
	occurs in O stars
	is a kind of absorption line
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

Kinds of interstellar line :

• D line (2 kinds, 11 facts) - Spectral line of neutral sodium, also the strongest interstellar line.
• HK line