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Table 1
Characteristics of Vela X-1.
| Parameter | Value | Ref. |
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| Binary system (Vela X-1): | ||
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| d (kpc) | 1.9 ± 0.2 | 1 |
| asini (ls) | 113.98 ± 0.13 | 2 |
| P (d) | 8.964357 ± 0.000029 | 3 |
| Tecl (MDJ) | 52 974.227 ± 0.007 | 3 |
| e | 0.0898 ± 0.0012 | 2 |
| i (°) | 78.8 ± 1.2 | 4 |
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| Pulsar (4U 0900-40): | ||
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| LX (erg s-1) | 3.5 × 1036 | 5 |
| MX (M⊙) | 1.770 ± 0.083 | 4 |
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| Supergiant (HD 77 581): | ||
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| M⋆ (M⊙) | 24.00 ± 0.37 | 4 |
| R⋆ (R⊙) | 31.82 ± 0.28 | 4 |
| Ṁ⋆ (M⊙ yr-1) | 1.5 − 2 × 10-6 | 5 |
| V (km s-1) | 1105 ± 100 | 6 |
Reference. (1) Sadakane et al. (1985); (2) Bildsten et al. (1997); (3) Kreykenbohm et al. (2008); (4) Rawls et al. (2011); (5) Watanabe et al. (2006); (6) Prinja et al. (1990).
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