Table 1.
Sample of new O-type stellar groups in this paper.
| ID | Other IDs | O/WR/LBV stars | Spectral type | Ref. |
|---|---|---|---|---|
| O-017 | Heart nebula | HD 15570 | O4 If | S11 |
| IC 1805 | HD 15558 A (†) | O4.5 III(fc)p + O8: | M19 | |
| Sh 2-190 | HD 15629 | O4.5 V((fc)) | S11 | |
| W4 | KM Cas | O9.2 IVn | TW | |
| At least five others | ||||
| O-018 | Lagoon nebula | 9 Sgr A,B | O3.5 V((f*)) + O5-5.5 V((f)) | R12 |
| M8 | HD 165052 | O6.5 V((f))z + O6.5 V((f))z | TW | |
| NGC 6523+6530 | Herschel 36 | O7.5 V + O9 V + B0.5 V | A10 | |
| Sh 2-25 | HD 164816 | O9.5 V + O9.7 V | TW | |
| W 29 | Possibly two others | |||
| O-019 | Eagle nebula | HD 168076 A,B (†) | O4 IV(f) | M16 |
| M16 | BD −13 4923 (†) | O4 V((f)) + O7.5 V | M19 | |
| NGC 6611 | ALS 15 360 | O6.5 V((f))z | TW | |
| Sh 2-49 | HD 168075 | O6.5 V((f)) + B0-1 V | S09 | |
| RCW 165 | At least eight others | |||
| W 37 | ||||
| O-020 | Rosette nebula | HD 46223 | O4 V((f)) | S11 |
| NGC 2244 | HD 46150 | O5 V((f))z | S11 | |
| Sh 2-275 | At least four others | |||
| W 16 | ||||
| O-021 | NGC 2362 | τ CMa Aa (†) | O9.2 Iab: | M20 |
| τ CMa cluster | τ CMa Ab (††) | O9 III | M20 | |
| O-022 | NGC 6231 | WR 79 | WC7 + O4 III-I(f) | TW |
| Collinder 315 | HD 152233 Aa,Ab | O6 II(f) | S14 | |
| HD 152248 Aa,Ab | O7 Iabf + O7 Ib(f) | S14 | ||
| At least eleven others | ||||
| O-023 | Orion nebula | θ1 Ori Ca,Cb (†) | O7 f?p var | M19 |
| M42+M43 | θ2 Ori A (†) | O9.2 V + B0.5: V(n) | M19 | |
| NGC 1976+1982 | ||||
| O-024 | γ Vel cluster | γ2 Vel (††) | WC8 + O7/8.5 III-II | TW |
| Pozzo 1 | ||||
| Brandt 1 | ||||
| O-025 | Trumpler 16 E | η Car (†) | LBV + O: | S06 |
| HDE 303 308 A,B | O4.5 V((fc)) | S14 | ||
| CPD −59 2641 | O6 V((fc)) | S14 | ||
| At least ten others | ||||
| O-026 | σ Ori cluster | σ Ori Aa,Ab,B (†) | O9.5 V + B0.2 V + B0.2 V(n) | M21 |
Notes.
References. A10: Arias et al. (2010), M16: Maíz Apellániz et al. (2016), M19: Maíz Apellániz et al. (2019b), M20: Maíz Apellániz & Barbá (2020), M21: Maíz Apellániz et al. (2021c), R12: Rauw et al. (2012), S06: Smith (2006a), S09: Sana et al. (2009), S11: Sota et al. (2011), S14: Sota et al. (2014), TW: This work.
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