Fraunhofer lines

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Fraun·ho·fer lines

 (froun′hō′fər)
pl.n.
A set of several hundred dark lines appearing against the bright background of the continuous solar spectrum and produced by absorption of light by the cooler gases in the sun's outer atmosphere at frequencies corresponding to the atomic transition frequencies of these gases.

[After Joseph von Fraunhofer (1787-1826), German physicist.]

Fraunhofer lines

(German ˈfraunhoːfər)
pl n
(Anatomy) a set of dark lines appearing in the continuous emission spectrum of the sun. It is caused by the absorption of light of certain wavelengths coming from the hotter region of the sun by elements in the cooler outer atmosphere
[named after J. von Fraunhofer (1787–1826), German physicist]

Fraunhofer lines

Dark lines seen on the Sun and other stars, named after their 1814 Bavarian discoverer.
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References in periodicals archive ?
Quasars whose spectra show such broad absorption lines are known as "BAL quasars.
Spectroscopic observations map the Mrk 509 warm absorber, study the mini-broad absorption line quasar PG 1126-041, determine the source of reddening in low ionization BAL quasars, and probe quasar winds using narrow intrinsic absorption lines.
Atomic and molecular absorption lines are very stable under changing environmental conditions and are excellent references for this purpose.
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.
2 misses most of the infrared energy from earth by having absorption lines outside of this band, at 6 and 15[mu]m.