2025RNAAS...9..259G

Query : 2025RNAAS...9..259G

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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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* EX Hya CV* 12 52 24.2222471899 -29 14 55.999766523   13.505 13.491 13.549   M5-6V 730 0
2 V* DQ Her CV* 18 07 30.2510391864 +45 51 32.564791872   14.605 14.443 14.800   M3+Ve 1048 1
3 V* FO Aqr CV* 22 17 55.3796835600 -08 21 03.754995948   13.533 13.445 13.414   ~ 378 0

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