Table 5
Radial-velocity orbital solutions, for circular and eccentric orbits.
| Parameter | VFTS 450 | VFTS 652 | ||
| circ. | ecc. | circ. | ecc. | |
|
|
||||
| Pphot (d) | 6.892583 | 8.589555 | ||
| ± | 0.000039 | 0.000090 | ||
 (MJD) |
54 761.421 | ··· | 54 665.242 | ··· |
| ± | 0.007 | 0.014 | ||
| Pspec (d) | 6.892325 | 6.892242 | 8.589534 | 8.589413 |
| ± | 0.000124 | 0.000080 | 0.000089 | 0.000067 |
| γ (kms-1) | 248.46 | 246.26 | 253.09 | 255.32 |
| ± | 1.61 | 1.10 | 0.83 | 0.65 |
| K (kms-1) | 208.8 | 207.6 | 201.6 | 199.8 |
| ± | 2.2 | 1.5 | 1.4 | 1.0 |
| e | ≡ 0 | 0.0722 | ≡0 | 0.0443 |
| ± | 0.0071 | 0.0050 | ||
| Ω (°) | ··· | 356.2 | ··· | 10.0 |
| ± | 6.3 | 5.4 | ||
| T0 (MJD) | 54 761.268 | 54 761.214 | 54 897.050 | 54 897.300 |
| ± | 0.021 | 0.116 | 0.011 | 0.127 |
| f(M) (M⊙) | 6.51 | 6.35 | 7.31 | 7.10 |
| ± | 0.20 | 0.13 | 0.15 | 0.11 |
| a1sini (R⊙) | 28.43 | 28.20 | 34.22 | 33.88 |
| ± | 0.29 | 0.20 | 0.24 | 0.18 |
| rms residual (kms-1) | 13.8 | 9.1 | 7.5 | 5.4 |
| q ( = M1/M2) | 0.61 | 0.40 | ||
| ± | 0.05 | 0.05 | ||
| M1sin3(i) (M⊙) | 10.4 | 10.2 | 5.6 | 5.5 |
| ± | 1.5 | 1.4 | 1.2 | 1.2 |
| M2sin3(i) (M⊙) | 16.9 | 16.5 | 14.2 | 13.8 |
| ± | 1.2 | 1.0 | 1.1 | 1.1 |
Notes. Parameters are based on primary-star radial velocities, excepting the photometric period, Pphot; the photometrically determined value of the time of circular-orbit maximum radial velocity, ; and the mass ratio q (Sect. 3.2). Note that the T0 parameter has different meanings for circular and eccentric orbits (times of maximum velocity and of periastron passage, respectively); for both targets, the numerical values from the spectroscopic solutions are coincidentally similar only because Ω ≃ 0° in each case.
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