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comparison spectrum

A Dictionary of Astronomy | 1997 | Â© A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

comparison spectrum A reference spectrum containing lines of accurately known wavelengths which can be used to calibrate astronomical spectra. A comparison spectrum of emission lines is usually produced in an arc-lamp attached to the spectrograph, and is recorded immediately before or after the spectrum of the object under study. Alternatively, absorption lines can be superimposed on the spectrum during the exposure using an iodine cell.

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"comparison spectrum." A Dictionary of Astronomy. 1997. Encyclopedia.com. 10 Nov. 2009 <http://www.encyclopedia.com>.

"comparison spectrum." A Dictionary of Astronomy. 1997. Encyclopedia.com. (November 10, 2009). http://www.encyclopedia.com/doc/1O80-comparisonspectrum.html

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