  We report the detection of As V resonance lines observed in the Far
Ultraviolet Spectroscopic Explorer (FUSE) spectra of three hot DA white dwarfs:
G191-B2B, WD0621-376, and WD2211-495. The stars have effective temperatures
ranging from 60,000 K to 64,000 K and are among the most metal-rich white
dwarfs known. We measured the arsenic abundances not only in these stars, but
also in three DO stars in which As has been detected before: HD149499B, HZ21,
and RE0503-289. The arsenic abundances observed in the DA stars are very
similar. This suggests that radiative levitation may be the mechanism that
supports arsenic. The arsenic abundance in HZ21 is significantly lower than
that observed in HD149499B, even though the stars have similar atmospheric
parameters. An additional mechanism may be at play in the atmospheres of these
two DO stars.
