Ultracool Subdwarfs: Metal-poor Stars and Brown Dwarfs Extending into the Late-type M, L and T Dwarf Regimes

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dc.creatorBurgasser, Adam J.
dc.creatorKirkpatrick, J. Davy
dc.creatorLepine, Sebastien
dc.date2004-09-08
dc.date2004-09-10
dc.date.accessioned2026-07-07T02:14:31Z
dc.date.available2026-07-07T02:14:31Z
dc.descriptionRecent discoveries from red optical proper motion and wide-field near-infrared surveys have uncovered a new population of ultracool subdwarfs -- metal-poor stars and brown dwarfs extending into the late-type M, L and possibly T spectral classes. These objects are among the first low-mass stars and brown dwarfs formed in the Galaxy, and are valuable tracers of metallicity effects in low-temperature atmospheres. Here we review the spectral, photometric, and kinematic properties of recent discoveries. We also examine L subdwarf classification, and discuss how a large, complete sample of substellar halo subdwarfs could probe the star formation history of the Galaxy's Population II. We conclude by outlining a roadmap for future work to more thoroughly explore this old and very low-mass population.
dc.descriptionv2. updated Figure 6
dc.identifierhttps://arxiv.org/abs/astro-ph/0409178
dc.identifierhttp://arxiv.org/abs/astro-ph/0409178
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/8143
dc.subjectAstrophysics
dc.titleUltracool Subdwarfs: Metal-poor Stars and Brown Dwarfs Extending into the Late-type M, L and T Dwarf Regimes
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