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Words related to spectral

spec·tral
S s

  • spectral type

    a category for classifying a star, as A star or G star, according to features of its spectrum, as its shape as a function of temperature and wavelength and its absorption spectrum, that indicate the surface temperature of the star and the presence of particular atoms or molecules in its outer layers: principal types are spectral types O, B, A, F, G, K, and M.

  • o star

    a very hot, massive, blue star of spectral type O, having a surface temperature between 30,000 and 50,000 K and an absorption spectrum with few lines, though the Balmer series of hydrogen lines is present and lines of ionized helium are detectable.

  • a star

    a blue to white star, as Altair, Sirius, or Vega, having a surface temperature between 7500 and 10,000 K and an absorption spectrum dominated by Balmer-series lines of hydrogen.

  • b star

    a massive, relatively hot, blue to white star, as Rigel or Spica, having a surface temperature between 10,000 and 30,000 K and with an absorption spectrum dominated by the Balmer series of hydrogen with lines of neutral helium present.

  • band spectrum

    a spectrum consisting of a number of bands of closely spaced lines that are associated with emission or absorption of radiation by molecules

  • blueshift

    a shift in the spectral lines of a stellar spectrum towards the blue end of the visible region relative to the wavelengths of these lines in the terrestrial spectrum: a result of the Doppler effect caused by stars approaching the solar system
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