Slitless spectroscopy
Encyclopedia
Slitless Spectroscopy is astronomical spectroscopy
done without a small slit to allow only light from a small region to be diffracted. It works best in sparsely populated fields, as it spreads each point source out into its spectrum, and crowded fields with be too confused to be useful. It also faces the problem that for extended sources, nearby emission lines will overlap.
The Crossley telescope
utilized a slitless spectrograph that was originally employed by Nicholas Mayall
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Spectroscopy
Spectroscopy is the study of the interaction between matter and radiated energy. Historically, spectroscopy originated through the study of visible light dispersed according to its wavelength, e.g., by a prism. Later the concept was expanded greatly to comprise any interaction with radiative...
done without a small slit to allow only light from a small region to be diffracted. It works best in sparsely populated fields, as it spreads each point source out into its spectrum, and crowded fields with be too confused to be useful. It also faces the problem that for extended sources, nearby emission lines will overlap.
The Crossley telescope
Crossley telescope
The Crossley telescope is an reflecting telescope located at Lick Observatory in the U.S. state of California.-History:Given to the observatory in 1895 by British politician Edward Crossley, it was rebuilt from the ground up as it was on a very flimsy mounting. It is still being used today in the...
utilized a slitless spectrograph that was originally employed by Nicholas Mayall
Nicholas Mayall
Nicholas Ulrich Mayall was an American observational astronomer. After obtaining his doctorate from the University of California, Berkeley, Mayall worked at the Lick Observatory, where he remained from 1934–1960, except for a brief period at MIT's Radiation Laboratory during World War II.During...
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