Table 1
O-type stars observed with good quality data during the pilot survey.
| Name | Spectral type | H [mag] | d [kpc] | SC [<0.5 mas] | SIC [0.5–50 mas] | IC | WC [0.05"–8"] | Total |
|---|---|---|---|---|---|---|---|---|
| Cyg OB2-5 A (BD+40 4220A) | O7Iafep | 4.745 | 1.748 | 1 | 0 | 2 | 2 | 5 |
| Cyg OB2-9 (HIP 101419) | O4.5If | 5.897 | 1.788 | 0 | 1 | 0 | 1 | 2 |
| Cyg OB2-10 (BD+41 3804) | O9.7Iab(†) | 5.839 | 1.376 | 0 | 0 | 1 | 3 | 4 |
| HD 17505 A | O6.5IIIn(f) | 6.177 | 2.258 | 1 | 0 | 1 | 1 | 3 |
| HD 19820 (CC Cas) | O8.5III(n)((f)) | 6.003 | 1.135 | 1 | 0 | 2 | 0 | 3 |
| HD 24431 | O9III | 5.845 | 0.922 | 0 | 0 | 1 | 1 | 2 |
| HD 28446 A (1 Cam A) | O9.7IIn | 5.459 | 0.760 | 1 | 0 | 1 | 1 | 3 |
| HD 30614 (α Cam) | O9Ia | 4.242 | 1.717 | 1 | 0 | 0 | 0 | 1 |
| HD 34078 (AE Aur) | O9.5V | 5.355 | 0.382 | 0 | 0 | 1 | 0 | 1 |
| HD 36861 (λ Ori A) | O8III((f)) | 3.769 | 0.438 | 0 | 0 | 1 | 1 | 2 |
| HD 45314 | O9:npe | 5.761 | 0.864 | 0 | 0 | 1 | 0 | 1 |
| HD 47129 | O8I+O7.5III(‡) | 5.806 | 1.283 | 1 | 0 | 1 | 2 | 4 |
| HD 47432 (V689 Mon) | O9.7Ib | 5.949 | 1.596 | 0 | 0 | 0 | 1 | 1 |
| HD 47839 (15 Mon AaAb) | O7V+B1.5/2V(⋆) | 5.322 | 3.974 | 0 | 0 | 0 | 1 | 1 |
| HD 167971 (MY Ser AaAb) | O8Iaf(n)+O4/5 | 5.315 | 1.339 | 1 | 0 | 1 | 0 | 2 |
| HD 188001 (9 Sge) | O7.5Iabf | 6.166 | 1.833 | 0 | 0 | 0 | 0 | 0 |
| HD 193322 AaAb | O9IV(n) | 5.688 | 1.001 | 1 | 0 | 1 | 3 | 5 |
| HD 195592 | O9.7Ia | 4.911 | 1.729 | 1 | 0 | 0 | 0 | 1 |
| HD 201345 | ON9.2IV | 8.171 | 1.828 | 0 | 0 | 0 | 1 | 1 |
| HD 202214 AaAb | O9.5IV | 5.505 | 1.032 | 1 | 0 | 1 | 1 | 3 |
| HD 206183 | O9.5IV-V | 7.193 | 0.901 | 0 | 0 | 0 | 2 | 2 |
| HD 206267 AaAb | O6.5V((f))+O9/B0V | 5.254 | 0.789 | 1 | 0 | 0 | 4 | 5 |
| HD 207198 | O8.5II | 5.318 | 0.978 | 0 | 0 | 1 | 1 | 2 |
| HD 209975 (19 Cep) | O9Ib | 4.935 | 0.959 | 0 | 0 | 0 | 4 | 4 |
| HD 210809 | O9Iab | 7.401 | 3.661 | 0 | 0 | 0 | 0 | 0 |
| HD 210839 (λ Cep) | O6.5I(n)fp | 4.618 | 0.832 | 0 | 0 | 0 | 0 | 0 |
| HD 217086 | O7Vnn((f))z | 6.100 | 0.830 | 0 | 0 | 0 | 2 | 2 |
| HD 228779 | O9Iab(†) | 5.834 | 1.653 | 0 | 0 | 0 | 0 | 0 |
| HD 229196 | O6II(f) | 6.079 | 1.720 | 0 | 0 | 1 | 0 | 1 |
Notes. The first column provides the identifier of the star. The second column contains the spectral type, with the ones marked with a(t) coming from Maíz Apellániz et al. (2016), the one marked wit a(‡) coming from Mahy et al. (2011), and the one marked with a(✰) coming from Skiff (2013), the others coming from Sota et al. (2011). The third column displays the magnitude in the H-band as found in the 2MASS All-Sky Catalog of Point Sources (Cutri et al. 2003). The fourth column gives the distance that separates us from the system according to Bailer-Jones et al. (2021), except for HD 202214 for which the distance comes from Megier et al. (2009). The fifth to eighth columns give the number of already known spectroscopic companions (SC), spectroscopic companions resolved by interferometry (SIC), interferometric companion (IC), and wide companion (WC), respectively. The references for already known companions can be found in the star-by-star description in Sect. 4. The ninth column gives the total number of known companions after this study.
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