Likely optical counterpart of the cool middle-aged pulsar J1957+5033

D. A. Zyuzin, S. V. Zharikov, A. V. Karpova +6

The 840 kyr old pulsar PSR J1957+5033, detected so far only in $\gamma$- and X-rays, is a nearby and rather cool neutron star with a temperature of 0.2--0.3 MK, a distance of $\la$1 kpc…