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2 results

  • 6 - Composition and Ionization from Stellar Spectra

  • from Part I - Stellar Properties
  • Stan Owocki, University of Delaware
  • Book:
    Fundamentals of Astrophysics
    Published online:
    08 October 2021
    Print publication:
    03 June 2021, pp 35-42

  • Summary

    In reality., stars are not perfect blackbodies, and so their emitted spectra don’t depend solely on temperature, but instead contain detailed signatures of key physical properties like elemental composition. For atoms in a gas, the ability to absorb, scatter, and emit light can likewise depend on the wavelength, sometimes quite sharply. We find that the discrete energies levels associated with atoms of different elements are quite distinct. We introduce the stellar spectral classes (OBAFGKM).