Table 3
Updated epochs, orbital periods, and period decay of the ten sources obtained by using all the available mid-eclipse times.
| Source | T0,ecl (MJD) | Porb,ecl (days) | Ṗorb/Porb (10-6 yr-1) |  (deg/yr) |
|
|
||||
| LMC X-4 | 53 013.5910(8) | 1.4083790(7) | − 1.00(5) | − |
| Cen X-3 | 50 506.788423(7) | 2.08704106(3) | − 1.800(1) | − |
| 4U 1700-377 | 53 785.850(7) | 3.411581(7) | − 1.6(1) | − |
| 4U 1538-522a,b | 52 855.061(13) | 3.7284140(76) | − 0.7(8) | 1.3(6) |
| SMC X-1 | 52 846.688810(24) | 3.891923160(66) | − 3.541(2) | − |
| SAX J1802.7-2017b | 52 168.245(34) | 4.5697(1) | 17(29) | − |
| XTE J1855-026b | 52 704.009(17) | 6.07415(8) | − 12(13) | − |
| Vela X-1b | 42 611.349(13) | 8.964427(12) | − 0.1(3) | 0.41(27) |
| EXO 1722-363b | 53 761.695(19) | 9.74079(8) | − 21(14) | − |
| OAO 1657-415 | 52 674.1199(17) | 10.447355(92) | − 3.4(1) | − |
Notes. We indicate in brackets the uncertainties at 1σ c.l. on the last digits of each reported value.
Epoch time and orbital period is derived from the linear fit; the orbital decay has been evaluated excluding the Uhuru and Ariel data.
The orbital period derivatives, Ṗ, are consistent with zero and thus the epoch times and orbital periods are estimated using Eq. (1)(linear fit).
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