Photometry of white dwarfs on the UVBY system

This paper reports intermediate band photometry using the Stromgren uvby system of 112 faint stars, mostly southern hemisphere white dwarfs. The internal errors and comparison with published measurements suggest that these data are on the same photometric system as Graham (1972) and have comparable errors. For the DA stars, the distribution of masses is determined using delta log g found from 66 objects. The mass distribution appears slightly asymmetrical toward higher masses, but for most stars, can be fitted by a Gaussian distribution of width + or - 0.24 in delta log g, corresponding to + or - 0.15 solar mass. Probably the observational errors are too large to determine this width accurately. Some aspects of the non-DA white dwarfs are also discussed. Of note is the possible separation of the carbon band white dwarfs into subclasses.