  We investigate the sample of 1175 new nonmagnetic DA white dwarfs with the
effective temperatures T_eff > 12000 K, which were extracted from the Data
Release 1 of the Sloan Digital Sky Survey. We determined masses, radii, and
bolometric luminosities of stars in the sample. The above parameters were
derived from the effective temperatures T_eff and surface gravities log g
published in the DR1, and the new theoretical M - R relations for carbon-core
and oxygen-core white dwarfs. Mass distribution of white dwarfs in this sample
exhibits the peak at M = 0.562 M_sol (carbon core stars), and the tail towards
higher masses. Both the shape of the mass distribution function and the
empirical mass - radius relation are practically identical for white dwarfs
with either pure carbon or pure oxygen cores.
