SIMBAD references

2006AJ....132.2372G - Astron. J., 132, 2372-2375 (2006/December-0)

Halo stars near the hydrogen-burning limit: the M/L subdwarf transition.

GIZIS J.E. and HARVIN J.

Abstract (from CDS):

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. Like an L4 dwarf, 2M 1626+3925 shows strong K I absorption and is very similar to, but hotter than, the late-L subdwarf 2MASS J05325346+8246465. It is unambiguously an L subdwarf. 2M 1640+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.

Abstract Copyright:

Journal keyword(s): Stars: Low-Mass, Brown Dwarfs - Stars: Subdwarfs

Simbad objects: 8

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2021.09.22-03:58:59

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