SIMBAD references

We observed the middle-aged radio pulsar B0656+14 with a CCD detector at the 6-m telescope. Broadband BVRI images show the following magnitudes of the pulsar counterpart: B=24.85(+0.19, -0.16), V=24.90(+0.16, -0.14), R=24.52(+0.12, -0.11), I=23.81(+0.27, -0.21). We fitted the UV-optical (space + ground-based) data with a two-component model which combines a power law (non-thermal component) with a thermal spectrum emitted by the neutron star surface. The power law component, with the energy power-law index α=1.5(+1.1,-1.2), dominates in the observed range. Constraints on the thermal component correspond to the Rayleigh-Jeans parameter G=T₆(R₁₀/d₅₀₀)²=4.1(+2.1, -4.1), where T=10⁶T₆K is the brightness temperature, R_∞=10R₁₀km is the neutron star radius as seen by a distant observer, and d=500d₅₀₀pc is the distance. The shape of the optical-UV spectrum of PSR B0656+14 differs considerably from those observed from other pulsars: the middle-aged Geminga and young Crab, Vela.