New ephemeris of the ADC source 2A 1822–371: a stable orbital-period derivative over 30 years

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Table 2:

Best-fit orbital solution for 2A 1822-371 derived from the analysis of the eclipse arrival times from 1977 to 2008.
Parameter	Units	P2000	This work
$T^{\rm e}_0$	MJD	45 614.80964(15)	45 614.80948(14)
$P_{\rm orb \; 0}$	s	20 054.1990(43)	20 054.2056(22)
$\dot P_{\rm orb}$	10^-10 s/s	1.78(20)	1.499(71)
$\chi^2 /$ d.o.f.		21.4 / 16	38.69 / 25

Notes. Errors are at 1 $\sigma$ c.l. on the last 2 digits. The value of $P_{\rm orb \; 0}$ is referred to $T^{\rm e}_0$ . The best-fit orbital parameters reported in this work are compared with the ephemeris given by P2000 (Parmar et al. 2000).

Source LaTeX | All tables | In the text

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