We present in this paper a catalogue of 112 massive
isolated white dwarfs, with masses M>0.8M⊙. Mass
determinations and other parameters of white
dwarfs were compiled from the
available literature. For each star we present averaged values
of mass, effective temperature, logarithm of surface gravity logg,
radius, distance, and the surface magnetic field for magnetic white
dwarfs.
The mass distribution of our sample is a slowly decreasing continuum
function for masses larger than 0.9M⊙, with an overlapping
secondary maximum at 1.04M⊙.
We conclude that the mass distribution of known massive magnetic white
dwarfs is flat, whereas nonmagnetic WDs exhibit a steeper mass
distribution towards the highest masses. The secondary maximum at 1.04M⊙ is caused exclusively by nonmagnetic white dwarfs.
We note that the 4 most massive stars with masses
M≥1.3M⊙ are magnetic white dwarfs. Our results show
also, that the occurrence of magnetism in massive white dwarfs does not
depend on the cooling age (above Teff=5000 K).