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Halo Stars Near the Hydrogen-Burning Limit: The M/L Subdwarf Transition

J. E. Gizis·J. Harvin
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Abstract

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.

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J. E. Gizis, J. Harvin. 2006-08-26. Halo Stars Near the Hydrogen-Burning Limit: The M/L Subdwarf Transition. https://doi.org/10.1086/508514

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