Optical Observations of the Nearby Isolated Pulsars With the 6 Meter Telescope

Astronomy and Astrophysics – Astrophysics

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Scientific paper

We present the results of photometric observations of nearby radio pulsars with the 6-m telescope of the SAO of RAS. The CCD images of fields around the radio positions have been obtained for four pulsars of different ages: PSR B0656+14, PSR B0950+08, PSR B0809+74, PSRJ0108-1431. The magnitudes of the middle-aged pulsar B0656+14 counterpart in the R and I bands (24.65 +- 0.11 and 24.04 +- 0.15) imply that the optical emission of this pulsar is basically non-thermal, as it is for the middle-aged Geminga, and for the young Crab and Vela pulsars. An object has been detected (R = 25.5 +- 0.3, with S/N ~4) at ~2^{'' ''} from the radio-position of PSR B0905+08, consistent with the position of the optical object previously detected with HST in the F130LP filter (m130 = 27.1). If the object is the pulsar counterpart, its broad-band spectrum indicates that the optical emission of this old pulsar is also of a nonthermal origin.

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