Timing the X-ray pulsating companion of the hot-subdwarf HD 49798 with NICER

Michela Rigoselli, Davide De Grandis, Sandro Mereghetti +1

HD 49798 is a hot subdwarf of O spectral type in a 1.55 day orbit with the X-ray source RX J0648.0-4418, a compact object with spin period of 13.2 s. We use recent data from the NI…