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Fraunhofer lines
Fraunhofer lines Absorption lines and bands in the spectrum of the Sun that were first labelled by J. vonFraunhofer in 1814. In decreasing wavelength from the red, they include A (759 nm), B (687 nm), C (656 nm), D (589 nm), E (527 nm), F (486 nm), G (431 nm), H (397 nm), and K (393 nm); Fraunhofer observed many other lines, labelling several weaker features a, b, etc. The A and B bands are due to absorption by oxygen molecules in the Earth's atmosphere, and the a band is due to absorption by terrestrial water vapour, but the remainder result from absorption in the Sun's photosphere. Most prominent are the D lines of sodium, the H and K lines of calcium, and the G band caused by neutral iron and the CH molecule, all of which are features of stars of spectral types F, G, and K.
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"Fraunhofer lines." A Dictionary of Astronomy. 1997. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>. "Fraunhofer lines." A Dictionary of Astronomy. 1997. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O80-Fraunhoferlines.html "Fraunhofer lines." A Dictionary of Astronomy. 1997. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-Fraunhoferlines.html |
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absorption spectrum
absorption spectrum A spectrum that consists primarily of dark absorption lines, created when light from a hot source passes through cooler material. The spectra of normal, cool stars such as the Sun fall into this category.
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"absorption spectrum." A Dictionary of Astronomy. 1997. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>. "absorption spectrum." A Dictionary of Astronomy. 1997. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O80-absorptionspectrum.html "absorption spectrum." A Dictionary of Astronomy. 1997. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-absorptionspectrum.html |
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selective absorption
selective absorption Any form of absorption which affects some wavelengths more than others. Examples are atmospheric extinction and interstellar absorption, both of which produce a reddening of starlight.
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"selective absorption." A Dictionary of Astronomy. 1997. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>. "selective absorption." A Dictionary of Astronomy. 1997. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O80-selectiveabsorption.html "selective absorption." A Dictionary of Astronomy. 1997. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-selectiveabsorption.html |
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absorption spectrum
absorption spectrum A graph that shows the percentage of each wavelength of light absorbed by a pigment (e.g. chlorophyll, which absorbs mainly in the red and blue parts of the spectrum).
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MICHAEL ALLABY. "absorption spectrum." A Dictionary of Ecology. 2004. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>. MICHAEL ALLABY. "absorption spectrum." A Dictionary of Ecology. 2004. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O14-absorptionspectrum.html MICHAEL ALLABY. "absorption spectrum." A Dictionary of Ecology. 2004. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O14-absorptionspectrum.html |
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absorption spectrum
absorption spectrum A graph that shows the percentage of each wavelength of light absorbed by a pigment (e.g. chlorophyll, which absorbs mainly in the red and blue parts of the spectrum).
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MICHAEL ALLABY. "absorption spectrum." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>. MICHAEL ALLABY. "absorption spectrum." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O7-absorptionspectrum.html MICHAEL ALLABY. "absorption spectrum." A Dictionary of Plant Sciences. 1998. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O7-absorptionspectrum.html |
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absorption spectrum
absorption spectrum see spectrum . |
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"absorption spectrum." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>. "absorption spectrum." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1E1-X-absorpsp.html "absorption spectrum." The Columbia Encyclopedia, 6th ed.. 2011. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-X-absorpsp.html |
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Fraunhofer lines
Fraunhofer lines : see sun . |
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"Fraunhofer lines." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>. "Fraunhofer lines." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1E1-X-Fraunhof.html "Fraunhofer lines." The Columbia Encyclopedia, 6th ed.. 2011. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-X-Fraunhof.html |
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absorption spectrum
absorption spectrum See spectrum.
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Cite this article
"absorption spectrum." A Dictionary of Biology. 2004. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>. "absorption spectrum." A Dictionary of Biology. 2004. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O6-absorptionspectrum.html "absorption spectrum." A Dictionary of Biology. 2004. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O6-absorptionspectrum.html |
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