absorption line


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Related to absorption line: absorption spectrum, Emission lines, Spectral lines, Absorption spectra

absorption line

A black line in the continuous spectrum of light passing through an absorbing medium.
See also: line
References in periodicals archive ?
Spectroscopic observations allow observers to estimate the rotation velocity from the broadening of absorption lines, and confirm that a velocity derived from spectroscopic data matches the brightness variation timescale as the star rotates.
The evaporating comet, which is what we see with comets such as Halley and next year's highly anticipated Comet ISON, creates a brief, telltale absorption line in the spectrum of a star.
So, if light from both images carried the same fingerprint -- the same absorption line -- this would indicate that the hydrogen cloud was wide enough for both beams to pass through it.
If you name a particular absorption line in an atom, I can devise a way to make that absorption line from reasonably to very transparent.
By focusing on a single absorption line in the solar spectrum, researchers can detect motion by measuring how much that line's wavelength has shifted from its normal position.
Characteristic narrow absorption lines, observed at 380 and 435 nm, are most likely from forbidden spin transitions in ferrous iron.
We have analyzed Fe 11 absorption lines toward several of the reddened stars included in the FUSE survey of molecular hydrogen abundances in translucent clouds.
So, when patterns of dark absorption lines with just those spacings show up in the spectra of quasars, astronomers conclude that an intervening gas cloud contains particular types of atoms.