absorption lines


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ab·sorp·tion lines

the dark lines in the solar spectrum corresponding to wavelengths originally emitted by inner layers of the Sun but then absorbed by various elements present in gaseous form in cooler layers and in the Earth's atmosphere.
Synonym(s): Fraunhofer lines

ab·sorp·tion lines

(ăb-sōrp'shŭn līnz)
Dark lines in the solar spectrum due to absorption by the solar and the earth's atmosphere.

absorption lines

In spectroscopy, dark lines of the solar spectrum.
References in periodicals archive ?
Atmospheric methane and molecular hydrogen absorb some of the light, leaving dark absorption lines in the spectra.
One guess is that the features are redshifted molecular carbon absorption lines in a star roughly one billion light-years away.
The absorption lines created by hydrogen found in intervening clouds and galaxies are also redshifted.
As a result, a typical quasar spectrum consists of a line of strong emission -- the Lyman-alpha radiation shifted to visible light -- followed by a series of weak absorption lines at shorter wavelengths.
The presence of many clouds at different distances creates a thicket of absorption lines, called the Lyman alpha forest, within the spectrum of light emitted by the quasar.
Using Hubble's Goddard High-Resolution Spectrograph to precisely measure the ultraviolet absorption lines, Linsky and his co-workers calculated the deuterium-hydrogen ratio at about 15 parts per million, with an uncertainty of less than 10 percent.
Together, the clouds create a thicket of absorption lines -- called the Lyman alpha forest -- within the spectra of quasars.