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absorption lines

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absorption lines

In astronomy, dark lines in the spectrum of a hot object due to the presence of absorbing material along the line of sight. Absorption lines are caused by atoms absorbing light from the source at sharply defined wavelengths. Numerous absorption lines in the spectrum of the Sun (Fraunhofer lines) allow astronomers to study the composition of the Sun's outer layers. Absorption lines in the spectra of stars give clues to the composition of interstellar gas and dust.



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? Mentioned in ? References in periodicals archive
 
Atomic and molecular absorption lines are very stable under changing environmental conditions and are excellent references for this purpose.
NIST demonstrates hybrid wavelength calibration reference. (General ... by Journal of Research of the National Institute of Standards and Technology
Since the late 1960s, observers have been checking to see whether the spacings between the absorption lines in quasar spectra differ slightly from those observed in laboratory experiments.
Constant Changes by WEISS, PETER / Science News
16]O gas, which has many absorption lines in t his region.
NIST produces two new wavelength calibration standards for the ... by Journal of Research of the National Institute of Standards and Technology
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