The light from an astronomical source can consist of a continuous spectrum, an emission (bright line) spectrum, or an absorption (dark line) spectrum. Editor: Ian Czekala. Beyond that, one common case where spectroscopy becomes important is in analysis of magnetic resonance imaging (MRI), a common if highly expensive medical technology. Introduction This document is a basic introduction to capturing and processing calibrated astronomical spectra using the RSpec software and either a Star Analyser grating or a slit spectrometer. . an instrument for obtaining a spectrum; in astronomy, usually attached to a telescope to record the spectrum of a star, galaxy, or other astronomical object Contributors and Attributions Andrew Fraknoi (Foothill College), David Morrison (NASA Ames Research Center), Sidney C. Wolff (National Optical Astronomy Observatory) with many contributing authors. 2: Plate i38727, March 24, 1914). 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