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Stellar Spectral Classes

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Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
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    Type W:
    Spectra contain many bright lines.
    Divided into WC (Carbon Sequence) and WN (Nitrogen Sequence)
    Temperatures up to 80,000 C.
    Type O:
    Spectra contain both bright and dark lines.
    Temperatures between 40,000 and 35,000 C.
    Type B:
    Prominent Helium lines.
    Temperatures between 25,000 and 12,000 C.
    Type A:
    Prominent Hydrogen lines.
    Temperatures between 10,000 and 8,000 C.
    Type F:
    Prominent Calcium lines.
    Temperatures between 7,500 and 6,000 C.
    Type G:
    Many metallic lines, weaker hydrogen lines.
    Giants have temperatures between 5,500 and 4,200 C.
    Dwarfs have temperatures between 6,000 and 5,000 C.
    Type K:
    Strong metallic lines.
    Giants have temperatures between 4,000 and 3,000 C
    Dwarfs have temperatures between 5,000 and 4,000 C
    Type M:
    Complicated spectra containing many lines due to molecules.
    Giants have temperatures of 3,400 C.
    Dwarfs have temperatures of 3,000 C
    Type C (formerly types R and N):
    Strong Carbon lines.
    Temperatures between 5,000 and 2,000 C.
    Type S:
    Prominent lines due to Titanium Oxide and Zirconium Oxide.
    Temperatures of 2,600 C
    Types L, Y, and Y:
    Very cool Red Dwarfs and Brown Dwarfs.
    T are the Methane Dwarfs.
    Temperatures less than 2,00 C.
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