Table 4.
Summary of Ephemerides.
| Set | Year | TAnom | PA |
 |
U | deg/PA | T0(WR in front) | PS | ω(T0) |
|---|---|---|---|---|---|---|---|---|---|
| IUE LW | 1983.675 | 45582.4: | 3.71:: | 0.15:: | −42:: | −32:: | 45582.4:: | 3.4:: | 271° |
| IUE SW | 1983.673 | 45581.7: | 3.74: | −0.15: | 42: | 32: | 45581.8: | 4.1: | 259° |
| IUE | 1988.936 | 47504.0 | 3.74: | −0.057: | 110: | 12: | 47503.9: | 3.87: | 100° |
| IUE | 1992.061 | 48645.38 | 3.61: | −0.045 | 126 | 10.3 | 48644.30 | 3.71: | 207° |
| IUE | 1995.059 | 49740.17 | 3.72 | −0.040 | 157 | 8.5 | 49739.15 | 3.81 | 199° |
| IUE Ps fixed | 1995.058 | 49740.12 | 3.69 | −0.037 | 170 | 7.8 | 49739.16 | 3.766 | 195° |
| Morel | 1995.057 | 49739.59 | 3.71 | −0.034 | 187 | 7.2 | 49738.83 | 3.79 | 175° |
| XMM-Newton | 2010.785 | 55484.15 | 3.72 | −0.034 | 187 | 7.2 | 55482.16 | 3.80 | 100° |
| BRITE | 2015.888 | 57348.14 | 3.625 | −0.075 | 83.6 | 15.6 | … | 3.789 |
Notes. Columns 3–10 are obtained from the model fits to the observed light curves and radial velocities. TAnom and T0 are, respectively, the time of periastron and the time when the WR is in front of the companion, and are given in units of JD−2400000. PA and PS are the anomalistic and sidereal periods, respectively and are given in days. The rate of change of the argument of periastron, 
, is given in radians per day; U is the apsidal period, given in days; deg/PA is 
given in degrees per anomalistic period; and ω(T0) is the argument of periastron at time T0 in degrees measured from elongation. The uncertainties in the values are discussed in Sect. 4.4.
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