Extreme Ultraviolet Explorer observations of PSR B0656+14

The pulsar PSR B0656 + 14 has been observed at gamma-ray, X-ray, EUV, and o ptical energies. These data are consistent with emission originating from a thermal stellar surface augmented by a hot, thermal "polar-cap" and an add itional magnetospheric component. We have combined archival Extreme Ultravi olet Explorer (EUVE) and ROSAT data, together with recent analyses of optic al photometry, to characterize the surface thermal emission from PSR B0656 + 14. Because of differences in the EUVE and ROSAT flux for E < 0.18 keV, o ur combined-data models require a softer surface thermal component at close r distance with a larger intervening column, compared to models using only X-ray data. For a 0.1-2.0 keV source consisting of a dominant soft thermal blackbody that is augmented by both a smaller hot blackbody and a power-law optical component, we derive the source properties at 90% confidence to be T-soft = (4.7-5.5) x 10(5) K, an absorbing column density of N-H = (1.45-1 .65) x 10(20) cm(-2), a distance of d/R-10 = 135-190 pc, and T-hot = (1.13- 1.18) x 10(6) K.