STELLAR ASTROPHYSICS
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    luminosity class

    lumnosity classes
    A classification of stellar spectra according to luminosity for a given spectral type; it was introduced as part of the Morgan-Keenan classification. The luminosity class broadly indicates whether a star is a dwarf (that is, a main sequence star), a giant, or a supergiant, since luminosity is directly related to surface area. Luminosity class is expressed as a Roman numeral, from I to V, and appears after the spectral type; for example, Tau Ceti, with spectral type G8, is listed as a G8V object.


    Luminosity class Description
    Ia-0 Hypergiant (extreme supergiant)
    Ia Bright supergiant
    Iab Normal supergiant
    Ib Subluminous supergiant
    II Bright giants
    III Normal giants
    IV Subgiant
    V Main-sequence (dwarf) star


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