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Home All issues Volume 665 (September 2022) A&A, 665 (2022) A148 Full HTML
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Table 1

Main properties of the sample of 51 O-type SB1 binaries analysed in this work.

VFTS SpT (old) (a,b) SpT (new) (c) P(a) [d] epochs mean S/N f(a) [M⊙] f1/ftot(V)(d) Teff,1(e) [K] log L1(e) [[erg s−1]] M1,SpT (f) [M⊙] M1,ev(g) [M⊙] Mmin,2∙(h) [M0] log LX (i) [erg s−1]
64 O7.5 II(f) O8 II:(f) + (O7 V+O7 V) 903 ± 4 37 71 10.7 ± 0.4 0.55 33300 5.07 28 ± 5 <32.51
73 O9.5 III O9.5 IV + B: 150.60 ± 0.13 32 27 0.288 ± 0.024 ≈1 31 850 5.00 19 ± 3 –
86 O9 III((n)) O9.5 III + O8 IV:n 182.95 ± 0.14 32 84 1.0 ± 0.5(j) 0.56 30800 5.01 20 ± 5 –
93 O9.2 III-IV O8.5 V + B0.2: V 250.13 ± 0.33 32 67 0.051 ± 0.013(j) 0.79 34 500(k) 5.02(k) 21 ± 3 <32.22
120 O9.5 IV: (O9.2 IV + B) + (O9.5 V + O9.5 V) 15.6546 ± 0.0011 32 75 0.0217 ± 0.0012 0.35 32350 4.69 19±3 <32.28
171 O8 II-III(f) O8.5 III:(f) + B1.5: V 677.0 ± 0.8 32 116 0.0659 ± 0.0029 0.92 34250(k) 5.43(k) 21 ± 4 –
184 O6.5 Vnz O6.5 Vn + OB: 32.128 ± 0.022 32 65 0.0055 ± 0.0015 ≈1 38900 4.91 30 ± 6 –
191 O9.5 V O9.2 V + O9.7: V: 358.9 ± 0.8 32 50 0.42 ± 0.13 0.87 33400 4.81 20 ± 3 –
201 O9.7V + sec O9.7 V + B1.5: V 15.3270 ± 0.0020 32 29 0.55 ± 0.19(j) 0.70 32500 4.46 19±3 –
225 B0.7-1III-II B0 7 III 8.2337 ± 0.0004 32 62 0.0211 ± 0.0005 ≈1 24500 4.53 15±3 –
231 O9.7 IV:(n) + sec O9.7 V + B1.5: V 7.92911 ± 0.00022 32 39 0.61 ± 0.21(j) 0.67 31 450 4.42 19±3 –
243 O7 V(n)((f)) O7 V:(n)((f)) 10.4031 ± 0.0004 37 61 0.581 ± 0.028 ≈1 36 000(l) 5.20 (l) 27 ± 4 <32.15
256 O7.5-8 V((n))z O7.5 V: + OB: 246.0 ± 0.5 32 83 0.085 ± 0.010 ≈1 36900 4.98 25 ± 3 –
277 O9 V O9 V + B1.5: V 240.42 ± 0.13 32 77 0.33 ± 0.15 0.96 33900 5.00 20 ± 3 <32.03
314 O9.7 IV:(n) + sec O9.7 V(n) + B 2.550786 ± 0.000005(f) 32 44 0.345 ± 0.012(j) ≈1 32500 4.58 19±3 –
318 O((n))p O9.5 V + O9.2 V 14.0043 ± 0.0029 23 34 0.0181 ± 0.0026 0.67 32900 4.07 20 ± 3 –
329 O9.7 II-III(n) O9.5 V(n) + B1: V: 7.0491 ± 0.0004 32 64 0.43 ± 0.11(j) 0.78 32900 4.64 20 ± 3 –
332 O9.2 II-III O9 III + O9.2 V 1025 ± 9 37 106 10 ± 6(j) 0.58 31 800 5.19 20 ± 5 <31.99
333 O8 II-III((f)) O9 II((f)) + O6.5 V: 980.1 ± 1.5 37 272 2.4 ± 0.4(j) 0.76 33800 5.88 20 ± 6 32.20
350 O8 V O8.5 V + O9.5 V 69.570 ± 0.005 32 82 2.06 ± 0.33(j) 0.75 34900 5.12 21 ± 3 <31.86
386 O9 IV(n) O9 V(n) + B1 V: 20.451 ± 0.020(j) 32 114 0.060 ± 0.012(j) 0.84 32900 5.32 20 ± 3 <32.02
390 O5-6 V(n)((fc))z O5.5 V:((fc)) + O9.7: V: 21.9059 ± 0.0002(j) 32 54 0.505 ± 0.033(j) 0.85 40900 5.18 33 ± 5 <31.95
404 O3.5V(n)((fc)) O3.5: V:((fc)) + O5 V: 145.76 ± 0.08 32 110 4.8 ± 1.7(j) 0.58 47 000 5.55 45 ± 9 32.84
409 O4 V((f))z O3.5: V:((f)) + B: 22.1909 ± 0.0012 32 48 0.162 ± 0.008 ≈1 47 000 5.94 45 ± 9 <31.88
429 O7.5-8 V O7 V: + B1: V: 30.0450 ± 0.0003 ω 32 78 1.40 ± 0.04(j) 0.90 37 900 5.09 27 ± 4 <32.07
440 O6-6.5 II(f) O6: V:(f) + O8 V 1019 ± 9 32 144 0.148 ± 0.025 0.84 33 800(k) 5.63(k) 31 ± 5 <32.01
441 O9.5 V O9.2 V + B0.5V 6.86858 ± 0.00022 32 73 0.26 ± 0.05(j) 0.79 33400 4.77 20 ± 3 –
475 O9.7 III O9.7 V + B0V 4.05424 ± 0.00012 32 28 0.6 ± 0.4(j) 0.65 32500 4.72 19±3 –
479 O4-5 V((fc))z O4.5 V((fc))z + B: 14.7254 ± 0.0009 32 47 0.509 ± 0.024 ≈1 42900 5.14 39 ± 6 3 <31.91
481 O8.5 III O8.5 V + O9.7: V: 141.823 ± 0.009 32 128 1.57 ± 0.24 0.90 34900 5.29 21 ± 3 <32.18
514 O9.7 III O9.7 V 184.92 ± 0.11 32 55 0.175 ± 0.010 ≈1 32500 4.44 19±3 –
532 O3 V(n)((f*))z+OB O3.5: V:((f*)) + B III 5.796223 ± 0.000002(j) 32 79 0.022 ± 0.004(j) ≈1 44700(m) 5.74(m) 45 ± 9 31.92
603 O4 III(fc) O4 III:(fc) + OB: 1.756777 ± 0.000024 32 107 0.000265 ± 0.000020 ≈1 42200(m) 5.98(m) 61 ± 10 31.95
613 O8.5 Vz O9 V + O7.5V 69.16 ± 0.04 32 40 1.7 ± 1.2(j) 0.51 33900 4.64 20 ± 3 –
619 O7-8 V(n) O8: V 14.5043 ± 0.0026 32 42 0.074 ± 0.008 ≈1 35900 4.86 23 ± 3 –
631 O9.7 III(n) O9.7 V 5.37487 ± 0.00018 32 44 0.064 ± 0.004 ≈1 32500 4.75 19±3 –
645 O9.5 V((n)) O9.5 V 12.5458 ± 0.0016 37 35 0.038 ± 0.009 ≈1 32900 4.68 20 ± 3 –
657 O7-8 II(f) O7 II:(f) + OB: 63.466 ± 0.008 32 47 0.39 ± 0.04 ≈1 35300 5.52 35 ± 15 <31.83
702 O8 V(n) (O8 V(n) + OB) + (OB+OB) 1.981440 ± 0.000020(j) 32 33 0.244 ± 0.021(j) ≈1 35900 5.02 23 ± 3 <31.88
733 O9.7p O7.5 V + B1 II 5.922078 ± 0.000005 32 96 0.038 ± 0.005(j) 0.44 36900 5.23 25 ± 3 <31.95
736 O9.5 V O9.5 V + B: 68.800 ± 0.021 32 48 0.105 ± 0.006 ≈1 32900 4.70 20 ± 3 –
743 O9.5 V((n)) O9.5 V((n)) 14.9473 ± 0.0009 32 84 0.0199 ± 0.0014 ≈1 32900 4.72 20 ± 3 –
750 O9.5 IV O9.5 V + B: 417±8 37 59 0.27 ± 0.08 ≈1 32900 4.64 20 ± 3 –
769 O9.7 II-III O9.7 V 2.365648 ± 0.000016 32 48 0.0166 ± 0.0010 ≈1 32500 4.74 19±3 –
779 B1 II-Ib B1 II-III 59.945 ± 0.025 32 54 0.181 ± 0.004 ≈1 23 500(n) 4.73(n) 14±4 –
802 O7.5 Vz O7 V: + O8 Vn 181.88 ± 0.04 23 129 3.35 ± 0.28(j) 0.64 37 900 5.05 27 ± 4 <32.34
810 O9.7V + B1:V: O9.7 V + B1 V 15.6886 ± 0.0006 32 34 0.81 ± 0.20(j) 0.71 32500 4.36 19±3 –
812 O4-5 V((fc)) O4 V((fc)) 17.28443 ± 0.00035 32 88 0.0664 ± 0.0032 ≈1 43 900 5.48 40 ± 7 <32.14
827 B1.5 Ib B1.5 III 43.221 ± 0.017 32 58 0.0662 ± 0.0027 ≈1 21 000(n) 5.03(n) 13±4 <32.48
829 B1.5-2II B1.5 III 202.9 ± 0.9 32 56 0.037 ± 0.006 ≈1 20500(n) 4.78(n) 13±4 –
887 O9.5 II-IIIn O9.7: V: + O9.5: V 2.672807 ± 0.000035 32 65 0.32 ± 0.06(j) 0.55 32500 4.63 19±3 –

Notes. Provided are VFTS identifiers, previous spectral types (adopted from Almeida et al. 2017), new spectral types from our study, and orbital periods (from Almeida et al. 2017, possibly updated in our study). We also provide the number of epochs used, mean S/N of spectra, mass function, estimates for the mass of the primary from spectral-type calibration and evolution tracks, and the mass range of the companion M2.(a) Almeida et al. (2017), unless revised here. (b)Walborn et al. (2014). (c)Derived using disentangled spectra. colon (:) signifies uncertain classification, see Sota et al. (2011) and Walborn et al. (2014) for meaning of remaining qualifiers. (d)Flux ratio of the primary in the visual (see Sect. 3.3). Typical errors are 10%. (e)Unless stated otherwise, using spectral-type calibrations from Doran et al. (2013) and available photometry (see text for details). Representative errors are 2000 K (1 spectral type ordinate) and 0.3 dex (including uncertainties on SpT, luminosity class, light ratios, and reddening) on Teff and log L, respectively. (f)Mean evolutionary mass of all apparently-single stars with similar spectral types in Schneider et al. (2018). (g)Evolutionary mass obtained with the BONNSAI tool (Brott et al. 2011; Köhler et al. 2015; Schneider et al. 2014) using Teff and log L as input.(h)Mmin∙2 is evaluated from mass function using M1∙SpT. Errors represent 1σ (68% confidence interval). (i)X-ray detection with the Chandra Visionary programme T-ReX (Crowther et al. 2022). Targets with no entry were excluded from the X-ray analysis, either because they have log L < 5.0 [erg s−1], or due to complex diffuse background contamination. (j)Revised here. (k)Ramírez-Agudelo et al. (2017). (l)Shenar et al. (2022). (m)Bestenlehner et al. (2014). (n)McEvoy et al. (2015).

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