Cool Stars 14 - Submitted Abstract # 350
This version created on 05 October 2006

Extreme Subdwarfs from the rNLTT Catalog


J. L. Marshall, Observatories of the Carnegie Institute of Washington
D. L. DePoy, The Ohio State University
Andrew Gould, The Ohio State University

We present the results of a search for low-mass, extreme subdwarfs in
the solar neighborhood.  The sample is selected from the rNLTT catalog
of Salim & Gould (2003) using a reduced proper motion diagram.
Photometric and spectroscopic observations of 54 candidate extreme
subdwarfs are presented.  These extremely metal-poor, low-mass objects
are among the oldest stars in the Galaxy and may inform studies of
Galactic evolution and the Galactic merger history.  Studies of these
stars may also provide information about the transition between
late-type M dwarfs, L- and T-dwarfs, and giant planets.  

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