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Y-type star

(Y, Y-class star, Y dwarf)
(type of dwarf with a temperature less than 700K)

A Y-type star (Y-class star or Y dwarf) is a star in the Y-class, a spectral class for brown dwarfs cooler than T-type stars. Other than that, their spectra is not well-characterized. As of 2011, six bodies are known that fit the criteria. Characteristics:

dark brownconventional color
under 700Ksurface temperature

(star type,spectral type)
http://en.wikipedia.org/wiki/Stellar_classification
http://en.wikipedia.org/wiki/Brown_dwarf

Referenced by:
brown dwarf (BD)
spectral class
ultracool dwarf

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