Searching for orbital period modulation in X-ray observations of the symbiotic X-ray binary GX 1+4

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Table 3.

Orbital periods obtained from the spin frequency and spin-frequency derivative history.

Data set	P_LS (d)	P_EF (d)
ν_spin	1124(-)	1178(-)
${\dot{ν}}_{spin}$ $\dot{\nu}_{\mathrm{spin}}$	1194 $_{- 76}^{+ 20}$ $^{+20}_{-76}$	1212(37)

Notes. The first column lists the data set that was searched for periodicity. The spin frequency and spin-frequency derivative history are denoted by ν_spin and ${\dot{ν}}_{spin}$ $\dot{\nu}_{\mathrm{spin}}$ , respectively. The second and third column list the results obtained using the Lomb-Scargle (P_LS) and epoch-folding (P_EF) method. The quoted uncertainties are given at the 68% confidence level.

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