Table 3
Spectroscopic binary systems identified in Cygnus OB2 and containing at least one O-type star.
| Star | Binary type | Components | SpT | SpT ref. | Bin. ref. |
|---|---|---|---|---|---|
| Cyg OB2 #1 | SB1 | A, B(vis) | O8 IV(n)f + B | 1 | 13 |
| J20311833+4121216 | SB1 | A, B | O9.5 IV + B | 1 | 6 |
| Cyg OB2 #20 | SB1 | A, B | O9 IV + mid-B | 1 | 12 |
| Cyg OB2 #15 | SB1 | A, B | O8 III + B | 1 | 12 |
| CPR2002 A11 | SB1 | A, B | O7.5 Ib(f) + u | 2 | 6 |
| Cyg OB2 #17 | SB1 | A, B | O8 V + u | 4 | 4 |
| MT91-376 | SB1 | A, B | O9.7 III(n) + B: | 2 | 4 |
| J20330292+4117431 | SB1 | A, B | O7.5 V((f)) + u | 1 | 4 |
| Cyg OB2 #22B | SB1 | B1, B2 | O6 V((f)) + u | 9 | 10 |
| Cyg OB2 #22C | SB1 | C1, C2 | O9.5 IIIn + u | 9 | 7 |
| Cyg OB2 #9 | SB2 | A, B | O4 If + O5.5 III(f) | 1 | 8 |
| MT91-448 | SB1 | A, B | O6.5: V + u | 1 | 4 |
| Cyg OB2 #8A | SB2 | A1, A2, A3(vis) | O6 Ib(fc) + O4.5 III(fc) + u | 1 | 14 |
| Cyg OB2 #8D | SB1 | D1,D2,D3 | O8.5 V + O9 V + u | 4 | 4 |
| MT91-485 | SB1 | A, B | O8 V + early B-O | 2 | 4 |
| Cyg OB2 #74 | SB1 | A, B | O8 V + B2-O | 4 | 4 |
| Cyg OB2 #70 | SB1 | A, B | O9.5 IV(n) + u | 1 | 4 |
| Cyg OB2 #27 | SB2 | A1, A2, B(vis) | O9.7 V(n) + O9.7 V:(n) + u | 2 | 3 |
| MT91-720 | SB2 | A, B | O9.5 V + B1-2 V | 4 | 6 |
| Cyg OB2 #11 | SB1 (*) | A, B | O5.5 Ifc + u | 9 | 6 |
| Cyg OB2 #29 | SB1 | A, B | O7 V(n)((f))z + u | 2 | 4 |
| MT91-771 | SB2 | A, B | O7 V((f)) + O7 IV((f)) | 1 | 7 |
| Cyg OB2 #3 | SB2 | A1, A2, B(vis) | O8.5 Ib(f) + O6 III: + B0 IV | 1 | 13 |
| Cyg OB2 #5A | SB2 | A1,A2 | O6.5: Iafe + O7 Iafe | 1 | 15 |
| Cyg OB2 # 73 | SB2 | A, B | O8 Vz + O8 Vz | 2 | 12 |
| CPR2002 B17 | SB2 | A, B | O6 Iaf + O9: Ia: | 2 | 11 |
| CPR2002 A36 | SB2 | A, B | O9.5 II + O8.5 III | 16 | 4 |
| J20301838+4053466 | SB2 | A, B | O9 V + u | 0 | 0 |
| CPR2002 A32 | SB2 | A, B | O9.5 IV + u | 0 | 0 |
Notes. (vis) indicates that the second component is a visual companion. u indicates that the spectral type is undetermined. (*) Single and standard star in GOSSS (Sota et al. 2011). Maíz Apellániz et al. (2019) indicate that this is an isolated star based on Astralux images.
References. (0) This work, (1) Maíz Apellániz et al. (2019), (2) Maíz Apellániz et al. (2016), (3) Salas et al. (2015), (4) Kobulnicky et al. (2014), (5) Sota et al. (2014), (6)Kobulnicky et al. (2012), (7) Kiminki et al. (2012), Nazé et al. (2012), (9) Sota et al. (2011), (10) Maíz Apellániz (2010), (11) Stroud et al. (2010), (12) Kiminki et al. (2009), (13) Kiminki et al. (2008), (14) De Becker et al. (2004), (15) Rauw et al. (1999), (16) Maíz Apellaníz (priv. comm.).
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.