(type of star cooler than an M-type star)
An L-type star (L) is of the L-class
(L spectral class), cooler than M-type stars,
radiating mainly in the infrared.
They are generally dwarf stars (L dwarf), i.e., not a giant star.
They have metal hydride and alkalide metal absorption lines.
Some are considered brown dwarfs, never burning hydrogen.
(star type,spectral type)
brown dwarf (BD)
TW Hydrae association (TWA)