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Table 1

Journal of the ephemerides of X1822-371 discussed in this work.

Parameters Parmar et al. (2000) Burderi et al. (2010) Bayless et al. (2010) Ji et al. (2011)

(MJD) 45 614.80964(15) 45 614.80948(14) 45 614.81166(74) 45 614.80927(25)
Porb0 (s) 20 054.1990(43) 20 054.2056(22) 20 054.1866(69) 20 054.2181(41)
orb (×10-10 s/s) 1.78(20) 1.499(71) 2.12(18) 0.827(95)
χ2/(d.o.f.) 21.4/16 38.69/25 70.04/32 35.99/19

Notes. Uncertainties are at the 68% c.l. for a single parameter. We show the reference time of the eclipse arrival times in units of MJD, the orbital period Porb0 in units of seconds calculated at , the derivative of the orbital period orb in units of s/s, and finally the χ2/(d.o.f.) obtained fitting the eclipse arrival times with a quadratic function.

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