ar X iv : a st ro - p h / 06 08 57 3 v 1 2 6 A ug 2 00 6 Halo Stars Near the Hydrogen - Burning Limit : The M / L Subdwarf Transition

We present the first far-red spectra of the L subdwarf 2MASS J16262034+3925190 and the late M/early L subdwarf 2MASS J16403197+1231068. We confirm the ultracool subdwarf nature of these objects. 2M1626+3925 shows strong K I absorption, like an L4 dwarf, and is very similar to, but hotter than, the late L subdwarf 2MASS J05325346+8246465. It is unambiguously an L subdwarf. 2M1640+1231 is very similar to SSSPM J1444-2019, which has been classified as sdM9 or early sdL. In contrast to the hotter M subdwarfs, L subdwarfs are characterized by not only enhanced hydrides but also strong TiO. Progress in a classification system requires identification of more subdwarfs to map out their variations. Subject headings: stars: low-mass, brown dwarfs — subdwarfs