A tale of two periods: determination of the orbital ephemeris of the super-Eddington pulsar NGC 7793 P13

F. Fuerst, D. J. Walton, M. Heida +10

We present a timing analysis of multiple XMM-Newton and NuSTAR observations of the ultra-luminous pulsar NGC 7793 P13 spread over its 65d variability period. We use the measured pu…