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Fig. 17


Combined ultraviolet spectra of PG 0043+039 taken with the HST 2013 and 1991. We indicate the identifications of the strongest UV emission lines, the geo-coronal lines, and both cyclotron systems B and A with their 3rd to 7th harmonics. The integer numbers identify the emission humps with multiple of the cyclotron fundamental. We indicate the power-law continuum Nν ~ να with α = 0.69 ± 0.02. The modeling of both cyclotron line systems B and A is given at the bottom.

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