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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > absorption line > interstellar line > HK line
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HK line comparison table
Subject has definition is a kind of
interstellar lineSharp, 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.absorption line
HK line interstellar line

Next interstellar lineD line    Upinterstellar line