The New Luyten Two-Tenths catalog contains a large number of high-proper motion white dwarf candidates that remain to be spectroscopically confirmed .
We present new spectroscopic observations as well as SDSS archival spectra of 49 white dwarf candidates which have been selected from the revised NLTT catalog of Salim & Gould ( 62 ) .
Out of these , 34 are cool DA white dwarfs with temperatures ranging from approximately 5000 K up to 11690 K , and 11 are DC white dwarfs with temperatures ranging from 4300 K ( NLTT 18555 ) up to 11000 K. Three of the DA white dwarfs also display abundances of heavy elements ( NLTT 3915 , NLTT 44986 and NLTT 43806 ) and one is a cool magnetic white dwarf ( NLTT 44447 ) with an estimated magnetic field strength of 1.3 MG. We also present a new cool DQ white dwarf ( NLTT 31347 ) with an estimated temperature of 6250 K. We supplement our sample with SDSS ugriz photometry for a fraction of the newly identified white dwarfs .
A kinematical study of this sample of white dwarfs , characterized by proper motions ranging from 0.136 to 0.611 \arcsec yr ^ { -1 } suggest that they belong to the thin disk population .