Ultracool subdwarfs are low luminosity, late-type M and L dwarfs that exhibitspectroscopic indications of subsolar metallicity and halo kinematics. Theirrecent discovery and ongoing investigation have led to new insights into therole of metallicity in the opacity structure, chemistry (e.g. dust formation)and evolution of low-temperature atmospheres; the long-term evolution ofmagnetic activity and angular momentum amongst the lowest-mass stars; the formof the halo luminosity and mass functions down to the hydrogen-burning masslimit; and even fundamental issues such as spectral classification and absolutebrightness scales. This Splinter Session was devoted to bringing advances inobservational and theoretical ultracool subdwarf research to the attention ofthe low-mass stellar and brown dwarf communities, as well as to share resultsamong ultracool subdwarf enthusiasts.
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