(star-like object with less mass than a star)
A brown dwarf is a star-like object which has too little
mass to sustain fusion in the manner of main sequence stars.
Their mass is between that of Jupiter and a small star,
in the rough range of 10-90 Jupiter masses.
They can have spectral classes,
M-type star (M dwarf),
L-type star (L dwarf),
T-type star (T dwarf),
or Y-type star (Y dwarf).
Brown dwarfs are identified by the observed presence of
lithium and/or methane. The first observed brown dwarf
was identified as such in 1995. As of 2013, hundreds of
brown dwarfs were known.
Black Widow Pulsar (B1957+20)
Epsilon Indi (ε Indi)
Gliese-Jahreiss Catalog (GJ)
H-R diagram (HRD)
L-type star (L)
main sequence star
T-type star (T)
Two Micron All-sky Survey (2MASS)
CTIO Upper-Scorpius OB Association Survey (UScoCTIO)
Y-type star (Y)