The most recent version of the Catalog of Spectroscopically Identified White Dwarfs lists 2249 white dwarf stars .
Among these stars are 118 white dwarfs that have either reliable trigonometric parallaxes or color-based distance moduli which place them at a distance within 20 pc of the Sun .
Most of these nearby white dwarfs are isolated stars , but 35 ( 30 % of the sample ) are in binary systems , including such well known systems as Sirius A/B , and Procyon A/B .
There are also three double degenerate systems in this sample of the local white dwarf population .
The sample of local white dwarfs is largely complete out to 13 pc and the local density of white dwarf stars is found to be 5.5 \pm 0.8 x 10 ^ { -3 } pc ^ { -3 } with a corresponding mass density of 3.7 \pm 0.5 x10 ^ { -3 } M _ { \odot } pc ^ { -3 } .