This article outlines the discovery of spectra and stellar spectral classifications. Included are mnemonics of the spectral sequence, what spectra lines can tell astronomers about a star, how temperature and luminosity relate to the Hertzsprung-Russell diagram, and luminosity classifications for stars.
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Keywords:Informal Education,spectra,NSDL,luminosity,absolute magnitude,Undergraduate (Lower Division),oai:nsdl.org:2200/20061003060400594T,apparent magnitude,Higher Education,Stars,High School,NSDL_SetSpec_439869,Space Science,Spectroscopy,elements of stars,H-R diagrams,Astronomy,Physics,Spectral Types
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