EXTREME-ULTRAVIOLET OBSERVATIONS OF 9 PULSARS

We report the observation of nine pulsars using the Lexan (100 Angstro m) band of the Extreme Ultraviolet Explorer scanning telescopes. The o bservations, none of which resulted in positive detections, are used t o derive limits to the temperature of surface thermal radiation from t he objects. We compare the temperature limits with predictions from ne utron star cooling models. The N-HI toward our targets limits our abil ity to establish rigorous limits needed to discriminate among the mode ls. We also derive a limit to heating by magnetic monopole flux-cataly zed nucleon decay for the very old pulsar PSR J1455-3330, which is sim ilar to the limit derived for PSR B1929 + 10 and 3 orders of magnitude larger than the limit for PSR J0437-4715.