Table 1.
Age, radial-velocity dispersion, number of stars, and mass range for our sample of young clusters hosting massive stars.
| Cluster | Age | σ1D | N | Mass | Pmin | Age |
|---|---|---|---|---|---|---|
| (Myr) | (km s−1) | (stars) | (M⊙) | (days) | (ref.) | |
| IC 1805 | 1.6–3.5 | 65.5 ± 3.1 | 8 | 15–60 | 1.4+0.8 | 1 |
| IC 1848 | 3.0–5.0 | 50.3 ± 12.8 | 5 | 15–60 | 1.4+3.2 | 2 |
| IC 2944 | 2.0–3.0 | 31.4 ± 0.3 | 14 | 15–60 |
 |
3 |
| NGC 6231 | 3.5–5.4 | 67.6 ± 0.4 | 13 | 15–60 | 1.4+0.7 | 4 |
| NGC 6611 | 2.0–6.0 | 25.3 ± 1.6 | 9 | 15–60 |
 |
5 |
| Wd2 | 1.0–2.0 | 15.0 ± 0.1 | 44 | 6–60 |
 |
6 |
| M 17 | 0.0–2.0 | 5.5 ± 0.5 | 12 | 6–20 | 3500−2834 | 7 |
| M 8 | 1.0–3.0 | 32.7 ± 2.6 | 16 | 6–20 |
 |
8 |
| NGC 6357 | 0.5–3.0 | 26.9 ± 1.3 | 22 | 6–30 |
 |
8 |
| R136 | 1.0–2.0 | 25.0 ± 5.9 | 332 | 15–60 |
 |
9 |
References. (1) Sung et al. (2017); (2) Lim et al. (2014); (3) Baume et al. (2014); (4) van der Meij et al. (in prep.); (5) Gvaramadze & Bomans (2008); (6) Zeidler et al. (2018); (7) Ramírez-Tannus et al. (2017); (8) Ramírez-Tannus et al. (2020); (9) Hénault-Brunet et al. (2012).
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