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emission lines

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emission lines [i′mish·ən ‚līnz]
(spectroscopy)
Spectral lines resulting from emission of electromagnetic radiation by atoms, ions, or molecules during changes from excited states to states of lower energy.
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Although the changes in the optical spectrum are subtle, amounting to only a few percent of excess emission superimposed on the usual broad emission lines from the WR star, members had honed their observing and data reduction skills in the run up to the campaign and it proved possible to track the changes with good precision.
2 Increased Pro-Am cooperation in spectroscopy delivers results by Leadbeater, Robin / Journal of the British Astronomical Association
The material falling into a black hole emits light in narrow wavelength regions forming emission lines which can be seen when the light is dispersed into a spectrum.
Astronomers discover a pair of twin black holes by Asian News International
The meeting focused on active OB-stars as laboratories for the study of physical processes leading to stellar activity and the ejection of circumstellar material, particularly the orbiting disk that is central to rapidly rotating B-type stars with prominent emission lines of hydrogen in their spectrums (Be stars).
Active OB-Stars; laboratories for stellar and circumstellar physics; ... by SciTech Book News
 
 
 
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