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We have conducted a search for L subdwarf candidates within the photometriccatalogues of the UKIRT Infrared Deep Sky Survey and Sloan Digital Sky Survey.Six of our candidates are confirmed as L subdwarfs spectroscopically at opticaland/or near infrared wavelengths. We also present new optical spectra of threepreviously known L subdwarfs (WISEA J001450.17-083823.4, 2MASSJ00412179+3547133, ULAS J124425.75+102439.3). We examined the spectral typesand metallicity subclasses classification of known L subdwarfs. We summarisedthe spectroscopic properties of L subdwarfs with different spectral types andsubclasses. We classify these new L subdwarfs by comparing their spectra toknown L subdwarfs and L dwarf standards. We estimate temperatures andmetallicities of 22 late type M and L subdwarfs by comparing their spectra toBT-Settl models. We find that L subdwarfs have temperatures between 1500 K and2700 K, which are higher than similarly-typed L dwarfs by around 100-400 Kdepending on different subclasses and subtypes. We constrained the metallicityranges of subclasses of M, L and T subdwarfs. We also discussed the spectraltype and absolute magnitude relationships for L and T subdwarfs.

Primeval very low-mass stars and brown dwarfs. I. Six new L subdwarfs, classification and atmospheric properties