Open Access
Table 2
Orbital parameters and companion mass ranges for the 51 O-type SB1 binaries considered in this work.
| VFTS | SpT(a) | Porb (b) [d] | T0(b) [HJD-2400000] | e(b) | ω (b) | K1(b) [km s−1] | K2(a) [km s−1] | q(c) | P(BHIco)(d) | M2(c) [M⊙] | Comment |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 64 | O8 II:(f) + (O6 V+O6 V) | 903 ± 4 | 56349.5 ± 2.3 | 0.528 ± 0.010 | 351.3 ± 1.3 | 57.2 ± 0.6 | – |  |
– |  |
triple |
| 64A | O7 Vn: + O7 Vn | 1.327181 ± 0.000003(a) | 56350.633 ± 0.010(a) | 90(f) | 282.0 ± 36.0(a) | 323 ± 33 | 0.87 ± 0.14 | – | 23 5 ± 8 2 | SB2, contact, ecl. | |
| 73 | O9.5IV + B: | 150.60 ± 0.13 | 54940±4 | 0.203 ± 0.031 | –12.5 ± 9.0 | 27.0 ± 0.7 | – |  |
– |  |
SB2: |
| 86 | O9.5 III + O8 IV:n | 182.95 ± 0.14 | 55 026.2 ± 1.3 | 0.514 ± 0.030 | 344.9 ± 4.2 | 43.0 ± 8.0(α) | 48 ± 10 | 0.90 ± 0.25 | – | 17.5 ± 10.0 | SB2 |
| 93 | O8.5 V + B0.2:V | 250.13 ± 0.33 | 54881 ± 4 | 0.203 ± 0.027 | 224.8 ± 8.5 | 12.8 ± 1.1(α) | 20 ± 9 | 0.64 ± 0.29 | – | 13.5 ± 7.0 | SB2 |
| 120 | (O9.2 IV + B) + (O9.5 V + O9.5 V) | – | – | – | – | – | – | – | – | quad. | |
| 120A | B + B0 V | 15.6546 ± 0.0011(a) | 54802.88 ± 0.18(a) | 0.280 ± 0.015 | 47.8 ± 4.0 | 93.0 ± 17.0(a) | 92 ± 13 | 0.99 ± 0.23 | – | – | SB2 |
| 120B | O9.5 V + B | 17.4098 ± 0.0005(a) | 54 813.02 ± 0.05(a) | 90(f) | 20.0 ± 7.0(a) | 21 ± 7 | 0.95 ± 0.46 | – | 18.6 ± 10.8 | SB2, ecl. | |
| 171 | O8.5 III:(f) + B1.5: V | 677.0 ± 0.8 | 55 535.2 ± 1.8 | 0.555 ± 0.011 | 77.4 ± 2.1 | 11.8 ± 0.1 | – |  |
– |  |
SB2: |
| 184 | O6.5 Vn + OB: | 32.128 ± 0.022 | 54 873.4 ± 2.9 | 0.200 ± 0.075 | 53.1 ± 40.0 | 12.1 ± 1.1 | – |  |
– |  |
SB2: |
| 191 | O9.2 V + O9.7: V: | 358.9 ± 0.8 | 54 972 ± 19 | 0.220 ± 0.070 | 236.6 ± 18.9 | 23.0 ± 2.4 | – |  |
 |
SB2 | |
| 201 | O9.7V + B1.5: V | 15.3270 ± 0.0020 | 54872.51 ± 0.28 | 0.463 ± 0.041 | 5.5 ± 3.4 | 79.0 ± 9.0(a) | 105 ± 26 | 0.75 ± 0.21 | – | 14.0 ± 5.5 | SB2 |
| 225 | B0.7 III | 8.2337 ± 0.0004 | 54 850.25 ± 0.34 | 0.021 ± 0.008 | 319.7 ± 13.4 | 29.2 ± 0.2 | – |  |
23% |  |
SB1 |
| 231 | O9.7V + B1.5: V | 7.92911 ± 0.00022 | 54 837.36 ± 0.10 | 0.406 ± 0.037 | 200.5 ± 5.4 | 99.0 ± 11.0(a) | 130 ± 25 | 0.76 ± 0.17 | – | 14.1 ± 5.1 | SB2 |
| 243 | O7 V:(n)((f)) | 10.4031 ± 0.0004 | 54 870.7 ± 1.5 | 0.017 ± 0.012 | 66.0 ± 53 | 81.4 ± 1.3 | – |  |
100% |  |
SB1, BH |
| 256 | O7.5V:+OB: | 246.0 ± 0.5 | 55 065.6 ± 2.2 | 0.629 ± 0.024 | 75.1 ± 3.3 | 19.2 ± 0.6 | – |  |
– |  |
SB2: |
| 277 | O9 V + B1.5: V | 240.42 ± 0.13 | 54 875.2 ± 0.6 | 0.928 ± 0.014 | 302.7 ± 4.5 | 63.6 ± 7.9 | – |  |
– |  |
SB2 |
| 314 | O9.7 V(n) + B | 2.550786 ± 0.000005(a) | 54 891.407 ± 0.010(a) | 0.166 ± 0.012 | 248.9 ± 4.7 | 110.8 ± 1.3 | 232 ± 16 | 0.48 ± 0.03 | – | 8.9 ± 2.6 | SB2, ecl. |
| 318 | O9.5 V + O9.2 V | 14.0043 ± 0.0029 | 54 878.0 ± 0.5 | 0.083 ± 0.044 | –7.5 ± 15.7 | 23.3 ± 1.1 | 99 ± 11 | 0.24 ± 0.03 | – | 4.6 ± 1.6 | SB2 |
| 329 | O9.5 V(n) + B1:V: | 7.0491 ± 0.0004 | 54 855.94 ± 0.09 | 0.439 ± 0.021 | 334.6 ± 2.9 | 93.0 ± 8.0(a) | 131 ± 24 | 0.71 ± 0.14 | – | 13.9 ± 5.3 | SB2 |
| 332 | O9 III + O9.2 V | 1025 ± 9 | 55 064 ± 7 | 0.813 ± 0.057 | 185.4 ± 1.4 | 79.0 ± 10.0(a) | 46 ± 13 | 0.58 ± 0.18 | – | 11.4 ± 6.6 | SB2: |
| 333 | O9 II((f)) + O6.5 V: | 980.1 ± 1.5 | 55 336.1 ± 1.4 | 0.746 ± 0.003 | 115.55 ± 0.49 | 43.0 ± 2.5(a) | 34 ± 14 | 0.79 ± 0.33 | – | 16.1 ± 11.7 | SB2 |
| 350 | O8.5 V + O9.5 V | 69.570 ± 0.005 | 54 904.26 ± 0.20 | 0.351 ± 0.008 | 93.4 ± 1.5 | 70.3 ± 3.8(a) | 91 ± 20 | 0.77 ± 0.17 | – | 16.3 ± 5.4 | SB2 |
| 386 | O9 V(n) + B1 V: | 20.451 ± 0.020(a) | 54 816.5 ± 2.8(a) | 0.150 ± 0.050(a) | 165.0 ± 26(α) | 30.8 ± 2.1(a) | 64 ± 12 | 0.48 ± 0.1 | – | 9.6 ± 3.7 | SB2 |
| 390 | O5.5 V:((fc)) + O9.7: V: | 21.90590 ± 0.00020(a) | 54 990.43 ± 0.12(a) | 0.495 ± 0.017 | 274.1 ± 2.5 | 69.7 ± 1.3 | 137 ± 34 | 0.51 ± 0.13 | – | 16.7 ± 6.7 | SB2, ecl. |
| 404 | O3.5: V:((fc)) + O5 V: | 145.76 ± 0.08 | 54 993.2 ± 0.9 | 0.718 ± 0.016 | 99.6 ± 2.6 | 98.0 ± 11.0(a) | 106 ± 11 | 0.92 ± 0.14 | – | 41.5 ± 18.4 | SB2 |
| 409 | O3.5: V:((f)) + B: | 22.1909 ± 0.0012 | 54 876.60 ± 0.16 | 0.294 ± 0.012 | 105.2 ± 3.5 | 43.2 ± 0.7 | – |  |
– |  |
SB2: |
| 429 | O7V:+B1:V: | 30.0450 ± 0.0003(α) | 54 874.33 ± 0.05(a) | 0.559 ± 0.005 | 22.36 ± 0.72 | 92.4 ± 0.7 | 143 ± 27 | 0.65 ± 0.12 | – | 17 4±6 3 | SB2, ecl. |
| 440 | O6: V:(f) + O8 V | 1019 ± 9 | 54 900 ± 40 | 0.277 ± 0.026 | 160.7 ± 14.2 | 11.7 ± 0.7 | 29 ± 18 | 0.40 ± 0.25 | – | 12.4 ± 8.8 | SB2 |
| 441 | O9.2V + B0.5 V | 6.86858 ± 0.00022 | 54 861.19 ± 0.09 | 0.217 ± 0.020 | 340.1 ± 5.6 | 73.0 ± 5.0(a) | 108 ± 8 | 0.68 ± 0.07 | – | 13.2 ± 4.5 | SB2 |
| 475 | O9.7V + B0V | 4.05424 ± 0.00012 | 54 862.30 ± 0.06 | 0.573 ± 0.057 | –0.1 ± 2.6 | 135.0 ± 33.0(a) | 169 ± 58 | 0.80 ± 0.34 | – | 14.8 ± 7.5 | SB2 |
| 479 | O4.5 V((fc))z + B: | 14.7254 ± 0.0009 | 54 872.85 ± 0.13 | 0.310 ± 0.016 | 189.4 ± 2.2 | 73.0 ± 1.1 | – |  |
– |  |
SB2: |
| 481 | O8.5 V + O9.7: V: | 141.823 ± 0.009 | 54 986.20 ± 0.16 | 0.929 ± 0.004 | 37.99 ± 0.74 | 128.3 ± 5.5 | 303 ± 50 | 0.42 ± 0.07 | – | 8.9 ± 2.7 | SB2 |
| 514 | O9.7V | 184.92 ± 0.11 | 54 842.3 ± 1.5 | 0.411 ± 0.019 | 41.2 ± 2.6 | 22.9 ± 0.4 | – |  |
98% |  |
SB1,BH? |
| 532 | O3.5: V:((f*)) + B III | 5.796223 ± 0.000002(α) | 54 861.49 ± 0.07(a) | 0.460 ± 0.032 | 159.0 ± 3.1 | 37.5 ± 2.0(a) | 102 ± 32 | 0.37 ± 0.12 | – | 16 5±8 6 | SB2, ecl. |
| 603 | O4 III:(fc) + OB: | 1.756777 ± 0.000024 | 54 865.06 ± 0.12 | 0.107 ± 0.032 | 139.2 ± 27.1 | 11.4 ± 0.3 |  |
 |
SB2: | ||
| 613 | O9 V + O7.5 V | 69.16 ± 0.04 | 54804± 5 | 0.351 ± 0.061 | 293.9 ± 25.7 | 66.0 ± 15.0(a) | 96 ± 39 | 0.69 ± 0.32 | – | 13 7±7 8 | SB2 |
| 619 | O8: V | 14.5043 ± 0.0026 | 54869.1 ± 1.7 | 0.085 ± 0.040 | 161.6 ± 45.0 | 36.8 ± 1.4 | – |  |
(95%) |  |
SB1: |
| 631 | O9.7V | 5.37487 ± 0.00018 | 54 870.37 ± 0.07 | 0.007 ± 0.005 | 37.0 ± 6.6 | 48.6 ± 1.1 | – |  |
73% |  |
SB1 |
| 645 | O9.5 V | 12.5458 ± 0.0016 | 54 870.8 ± 0.4 | 0.235 ± 0.070 | −2.8 ± 10.7 | 31.6 ± 2.5 | – |  |
56% |  |
SB1 |
| 657 | O7 II:(f) + OB: | 63.466 ± 0.008 | 54 858.7 ± 0.4 | 0.480 ± 0.021 | 312.1 ± 3.9 | 44.6 ± 1.2 | 169 ± 38 | 0.26 ± 0.06 | – | 9 3±8 1 | SB2: |
| 702 | (O8 V(n) + OB) + (OB+OB) | – | – | – | – | – | – | – | – | quad. | |
| 702A | O8 V(n) + OB | 1.981595 ± 0.000030 | 54 869.00 ± 0.02 | 0(e) | 90(f) | 105.9 ± 3.0 | – |  |
– |  |
ecl. |
| 702B | OB + OB | 2.932818 ± 0.000025 | 4869.84 ± 0.07 | 0(e) | 90(f) | – | – |  |
– | – | ecl. |
| 733 | O7.5 V + B1 II | 5.922078 ± 0.000005 | 54 871.08 ± 0.16 | 0.002 ± 0.001 | 196.4 ± 10.2 | 39.4 ± 1.9(α) | 102.2 ± 0.9 | 0.39 ± 0.02 | – | 9 6±2 3 | SB2 |
| 736 | O9.5 V + B: | 68.800 ± 0.021 | 54922.1 ± 2.6 | 0.086 ± 0.020 | 255.3 ± 13.7 | 24.6 ± 0.5 | – |  |
– |  |
SB2: |
| 743 | O9.5 V((n)) | 14.9473 ± 0.0009 | 54 866.91 ± 0.31 | 0.012 ± 0.008 | 42.4 ± 7.9 | 23.4 ± 0.6 | – |  |
28% |  |
SB1 |
| 750 | O9.5 V + B: | 417 ± 8 | 55 247 ± 10 | 0.779 ± 0.039 | 44.2 ± 6.1 | 29.5 ± 1.6 | – |  |
– |  |
SB2: |
| 769 | O9.7V | 2.365644 ± 0.000016 | 54 868.340 ± 0.030 | 0.007 ± 0.005 | 333.9 ± 3.5 | 40.8 ± 0.8 | – |  |
25% |  |
SB1 |
| 779 | B1 II–III | 59.945 ± 0.025 | 54 903.3 ± 2.4 | 0.046 ± 0.011 | 84.3 ± 12.2 | 30.8 ± 0.2 | – |  |
87% |  |
SB1,BH? |
| 802 | O7 V: + O8 Vn | 181.88 ± 0.04 | 54 942.98 ± 0.25 | 0.602 ± 0.007 | 47.18 ± 0.78 | 70.4 ± 1.9(a) | 76 ± 14 | 0.93 ± 0.17 | 25 0 ± 9 0 | SB2 | |
| 810 | O9.7V + B1 V | 15.6886 ± 0.0006 | 54 892.32 ± 0.06 | 0.678 ± 0.008 | 359.0 ± 1.3 | 108.0 ± 9.0(a) | 162 ± 27 | 0.67 ± 0.12 | – | 12 4±4 2 | SB2 |
| 812 | O4 V((fc)) | 17.28443 ± 0.00035 | 54 856.95 ± 0.04 | 0.624 ± 0.009 | 339.5 ± 1.3 | 42.7 ± 0.6 | – |  |
– |  |
SB2: |
| 827 | B1.5 III | 43.221 ± 0.017 | 54 870.7 ± 0.5 | 0.244 ± 0.011 | 97.6 ± 3.4 | 25.3 ± 0.3 | – |  |
(56%) |  |
SB1: |
| 829 | B1.5 III | 202.9 ± 0.9 | 55 024 ± 10 | 0.273 ± 0.043 | 145.8 ± 11.4 | 12.6 ± 0.7 | – |  |
(34%) |  |
SB1: |
| 887 | O9.7:V:+O9.5:V | 2.672807 ± 0.000035 | 54 870.390 ± 0.030 | 0.056 ± 0.019 | 53.5 ± 4.8 | 105.0 ± 7.0(a) | 98 ± 12 | 0.93 ± 0.13 | – | 17 3±5 5 | SB2 |
Notes. Provided are VFTS identifiers, new spectral types from our study, orbital parameters, mass ratios, probability of the system to host a black hole assuming the companion is a compact object, estimated secondary mass, and individual comments. See text for details. (a)Derived in our study. (b)Derived by Almeida et al. (2017), unless otherwise stated. (c)Values and errors represent the median and 68% confidence intervals of the respective probability density function (see text for details). (d)The probability the companion is a black hole assuming it is a compact object, computed as the probability that M2 > 3 M⊙ (see Sect. 5.2). Probabilities for uncertain SB1 systems (SB1:), rounded to nearest integer, are provided in parentheses, and are omitted for uncertain SB2 systems (SB2:).(e)Adopted based on symmetry of light curve. (f)Fixed.
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