We present a comprehensive multiwavelength analysis of the hot DB white dwarf PG 0112 + 104 .
Our analysis relies on newly-acquired FUSE observations , on medium-resolution FOS and GHRS data , on archival high-resolution GHRS observations , on optical spectrophotometry both in the blue and around H \alpha , as well as on time-resolved photometry .
From the optical data , we derive a self-consistent effective temperature of 31 , 300 \pm 500 K , a surface gravity of log g = 7.8 \pm 0.1 ( M = 0.52 M _ { \odot } ) , and a hydrogen abundance of { log } N ( { H } ) / N ( { He } ) < -4.0 .
The FUSE spectra reveal the presence of C ii and C iii lines that complement the previous detection of C ii transitions with the GHRS .
The improved carbon abundance in this hot object is { log } N ( { C } ) / N ( { He } ) = -6.15 \pm 0.23 .
No photospheric features associated with other heavy elements are detected .
We reconsider the role of PG 0112 + 104 in the definition of the blue edge of the V777 Her instability strip in light of our high-speed photometry , and contrast our results with those of previous observations carried out at the McDonald Observatory .