Table 4
Predicted ΔTcalc (Eq. (2)), the measured epoch time lag, ΔTobs = Tπ/ 2 − Tecl, and the orbital period lag, ΔPobs = Porb,ecl − Porb,π/ 2 are given for the two sources 4U 1538-522 and Vela X-1.
| Source | Tecl | Tπ/ 2 | Porb,ecl | Porb,π/ 2 | ΔTobs | ΔTcalc | ΔPobs |
|
| (MJD) | (MJD) | (day) | (day) | (day) | (day) | (× 10-4 day) | (deg/yr) | |
|
|
||||||||
| 4U 1538-522a | 50 450.234(11) | 50 450.221(11) | 3.7284140(76) | 3.728337(22) | −0.013(15) | 0.0905(69) | 0.72(23) | 2.3(7) |
| 4U 1538-522b | 52 851.332(13) | 52 852.3207(92) | 3.7284140(76) | 3.728382(11) | 0.011(16) | 0.164(67) | 0.32(13) | 1.3(6) |
| Vela X-1 | 42 611.349(13) | 42 611.1693(43) | 8.964427(12) | 8.9644061(64) | −0.180(14) | −0.2275(55) | 0.21(14) | 0.41(27) |
Notes. The apsidal advance angle, 
, is also reported. We indicate in brackets the uncertainties at 1σ c.l. on the last digits of each reported value.
The best-fit values Tπ/ 2 and Porb,π/ 2 were obtained including all the epochs available in the literature until the work of (the last one is reported by Clark 2000).
Same as before, but using all epochs available up to the work published by Mukherjee et al. (2006).
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