A Search for Cool Subdwarfs: Stellar Parameters for 134 Candidates11Based in part on observations obtained with the Hobby‐Eberly Telescope, which is a joint project of the University of Texas at Austin, the Pennsylvania State University, Stanford University, Ludwig‐Maximillians‐Universität München, and Georg‐August‐Universität Göttingen.

Abstract

ABSTRACTThe results of a search for cool subdwarfs are presented. Kinematic (U, V, and W) and stellar parameters (Teff, log g, [Fe/H], and ξt) are derived for 134 candidate subdwarfs based on high‐resolution spectra. The observed stars span 4200 K < Teff < 6400 K and −2.70 < [Fe/H] < 0.25 including only eight giants (log g < 4.0). Of the sample, 100 stars have MgH bands present in their spectra. The targets were selected by their large reduced proper motion, by the offset from the solar‐metallicity main sequence, or from the literature. We confirm the claims made by Ryan that the NLTT catalog is a rich source of subdwarfs and verify the success of the reduced proper‐motion constraint in identifying metal‐poor stars.