Table 4.
Estimated masses of the two binary components of the Vela X-1/HD 77581 system as given by various authors, together with the assumed inclination i.
| Reference | i | MNS [M⊙] | Mopt [M⊙] | Ropt [R⊙] | Kopt [km s−1] | |
|---|---|---|---|---|---|---|
| Hutchings (1974) | 90 | 1.5–2.7 | – | – | 20.2 ± 1.1 | |
| – ditto – | 70 | 2.1–2.9 | – | – | 20.2 ± 1.1 | |
| Mikkelsen & Wallerstein (1974) | 90 | 1.0–3.0 | 10–30 | ∼30 | – | |
| – ditto – (plausible MOpt) | 90 | 1.5–3.0 | 20–25 | ∼30 | – | |
| Zuiderwijk et al. (1974) | 90 | ≥2.5 ± 0.3 | ≥30 ± 5 | – | 26 ± 0.7 | |
| van Paradijs et al. (1976) | 74–90 | 1.61 ± 0.27 | 21 ± 2.6 | – | 20 ± 1 | |
| Lamers et al. (1976) | – | 2.0 | 22 | 27 | – | |
| Rappaport et al. (1976) | ≥70 | 1.45 ± 0.16/(sin i)3 | 21 ± 0.9/(sin i)3 | – | – | |
| Vidal (1976) | 90 | 1.56–2.1 | 18.1–23.0 | – | – | |
| – ditto – | 80 | 1.64–2.2 | 19.0–23.7 | – | – | |
| – ditto – | 70 | 1.9–2.55 | 20.7–27.7 | – | – | |
| van Paradijs et al. (1977a) | > 74 | 1.67 ± 0.12 | 20.5 ± 0.9/(sin i)3 | – | 21.75 ± 1.15 | |
| Conti (1978) | 74 | 1.6 | 24 | 35 | – | |
| Vanbeveren et al. (1993) | – | – | 21.6–26.5 | 31–35 | – | |
| Joss & Rappaport (1984) | (JR84) | > 73 |  |
 |
 |
– |
| Bulik et al. (1995) | – | 1.34 ± 0.16 | – | – | – | |
| van Kerkwijk et al. (1995) | #1 | > 74 |  |
 |
 |
17.0−29.7 |
| – ditto – | #2 | > 73 |  |
 |
 |
20.8 ± 1.7 |
| – ditto – | #3 | > 75 |  |
 |
 |
24.6 ± 2.3 |
| Stickland et al. (1997) | (a) | > 73 | 1.39 ± 0.14/(sin i)3 | 21.41 ± 0.22/(sin i)3 | – | 17.8 ± 1.6 |
| – ditto – | (b) | > 73 | 1.33 ± 0.13/(sin i)3 | 21.42 ± 0.22/(sin i)3 | – | 17.8 ± 1.6 |
| – ditto – | (c) | > 73 | 1.45 ± 0.14/(sin i)3 | 21.42 ± 0.22/(sin i)3 | – | 17.8 ± 1.6 |
| Barziv et al. (2001) | > 73 | 1.86 ± 0.32 |  |
 |
21.7 ± 1.6 | |
| Quaintrell et al. (2003) | 70.1 ± 2.6 | 2.26 ± 0.32 | 27.9 ± 1.3 | 32.1 ± 0.6 | 21.2 ± 0.7 | |
| – ditto – | 90 | 1.88 ± 0.13 | 23.1 ± 0.2 | 26.8 ± 0.9 | 22.6 ± 1.5 | |
| Rawls et al. (2011) (analytic) | 83.6 ± 3.1 | 1.788 ± 0.157 | – | – | – | |
| – ditto – (numerical) | 78.8 ± 1.2 | 1.770 ± 0.083 | 24.00 ± 0.37 | 31.82 ± 0.37 | – | |
| Krtička et al. (2015)(†) | – | – | 23.5 | 30 | – | |
| Falanga et al. (2015) | 72.8 ± 0.4 | 2.12 ± 0.16 | 26 ± 1 | 29 ± 1 | – | |
| Giménez-García et al. (2016) | – | – | 21.5 ± 4.0 | (JR84) | – | |
Notes. Where provided, the estimated radius of the optical star is also given. Errors or uncertainty ranges are given as in the original publications. See text for the multiple solutions provided by van Kerkwijk et al. (1995) or Stickland et al. (1997). The latter underestimated Kopt according to Barziv et al. (2001) due to a data reduction error. Quaintrell et al. (2003) give a range of values, with the two extreme cases tabulated. (†)Refer to van Kerkwijk et al. (1995).
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