9_7_3

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 * 3. Spectroscopy is a vital tool for astronomers and provides a wealth of information**


 * account for the production of emission and absorption spectra and compare these with a continuous blackbody spectrum


 * describe the technology needed to measure astronomical spectra


 * identify the general types of spectra produced by stars, emission nebulae, galaxies and quasars


 * perform a first-hand investigation to examine a variety of spectra produced by discharge tubes, reflected sunlight, or incandescent filaments


 * analyse information to predict the surface temperature of a star from its intensity/wavelength graph


 * describe the key features of stellar spectra and describe how these are used to classify stars


 * describe how spectra can provide information on surface temperature, rotational and translational velocity, density and chemical composition of stars