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2025RNAAS...9..259G - Research Notes of the AAS, 9, 259 (2025/October-0)

A Refined Orbital Ephemeris for the Intermediate Polar FO Aquarii and Evidence for a Period Derivative.

GARNAVICH P., TWEDDALE J. and LITTLEFIELD C.

Abstract (from CDS):

We combine more than 40 yr 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 $\dot{P}=6.65\pm 0.81\times 1{0}^{-11}$.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Cataclysmic variable stars - DQ Herculis stars - Eclipsing binary stars - Orbital evolution

Simbad objects: 3

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