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Table 1
Selected Vela X-1 system parameters.
| Parameter | Value | Ref. |
|---|---|---|
| Orbital period Porb [days] | 8.964357 | (1) |
| Eccentricity e | 0.0898 | (2) |
| Orbital separation dNS [cm] | 3.5 × 1012 | (3) |
| Rotational velocity vrot ⋅ sini [km s−1] | 56 | (4) |
| Orbital speed of the NS vorb [km s−1] | 284a | – |
Notes. (a) Calculated from Porb and dNS, assuming a circular orbit.
References. (1) Kreykenbohm et al. (2008); (2) Bildsten et al. (1997); (3) Giménez-García et al. (2016) and (4) Fraser et al. (2010).
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