White dwarf stars represent the final state of most of
stars and their study can thus provide us very useful information
about our Galaxy and its evolution. We used the revised New Luyten
Two-Tenths (rNLTT) catalog to select high proper motion white dwarf
candidates. Spectra were obtained at the Cerro Tololo Inter-American
Observatory (CTIO) and extracted from the Sloan Digital Sky Survey
(SDSS). We determined their effective temperature and surface gravity
and using evolutionary mass-radius relations we also determined the
mass and cooling age for the objects from our sample. We conducted a
kinematical study. Some interesting objects will be discussed.
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