: Astronomy: spectral type

stellar astronomy > spectral classification > spectral type

spectral type

A group into which stars may be classified according to the characteristics of their spectra. Spectral type correlates with the star's effective temperature and color. There are seven main spectral types. From hot and blue to cool and red, they are O, B, A, F, G, K, and M. Each spectral type is divided into several subtypes. For example, from warmest to coolest, spectral type G is G0, G1, G2, G3, and so on to G9. A precise spectral classification requires determining the luminosity class. The Sun is spectral type G2 V. (An Etymological Dictionary of Astronomy and Astrophysics, by M. Heydari-Malayeri, https://dictionary.obspm.fr/index.php?formSearchTextfield=spectral+type&formSubmit=Search&showAll=1)

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