L-type star

L-type stars are a classification of brown dwarfs, which are objects that form like stars but do not undergo thermonuclear fusion. They are cooler than M-type stars, with surface temperatures ranging from about 1,500 to 2,500 Kelvin. Their spectra are characterized by absorption lines from alkali metals like rubidium and sodium, as well as metallic compounds such as iron hydride. L-type stars are part of an expanded stellar classification system that includes spectral types L, T, and Y, used for cooler objects than the traditional O, B, A, F, G, K, and M types.12