A Refined Orbital Ephemeris for the Intermediate Polar FO Aquarii and Evidence for a Period Derivative
Abstract
We combine more than 40 years of eclipse timings of the intermediate polar FO Aqr and derive new orbital ephemerides. The eclipse times are best fit with a second order polynomial, implying an 8σ detection of a period derivative. The results show that the orbital period of FO Aqr is currently increasing, with a derivative of P=6.650.81×10-11.
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