Table 1.
Isochronal ages for the 37 stellar groups in Sco-Cen as selected with SigMA in Ratzenböck et al. (2023).
| SigMA | Traditional | Group name | Number of sources (a) | Age PARSEC | Age BHAC15 | ||||
|---|---|---|---|---|---|---|---|---|---|
| regions | All | BPRP | GRP | BPRP | GRP | BPRP | GRP | ||
| (Myr) | (Myr) | (Myr) | (Myr) | ||||||
| 1 | US | ρ Oph/L1688 | 535 | 338 | 350 | 3.8 (3.4, 4.2) | 3.6 (3.3, 4.1) | 3.2 (3.1, 3.4) | 4.6 (4.4, 4.8) |
| 2 (c) | US | ν Sco | 150 | 98 | 101 | 5.8 (5.3, 7.6) | 6.2 (5.7, 7.7) | 3.9 (3.4, 4.1) | 5.7 (5.4, 6.1) |
| 3 | US | δ Sco | 691 | 485 | 505 | 9.8 (8.4, 11.0) | 10.5 (8.6, 11.0) | 6.4 (5.8, 7.5) | 7.8 (7.4, 8.8) |
| 4 (c) | US | β Sco | 285 | 200 | 206 | 7.6 (6.9, 8.4) | 8.1 (7.6, 8.4) | 4.8 (4.6, 5.3) | 7.0 (6.7, 7.6) |
| 5 | US | σ Sco | 544 | 381 | 415 | 10.0 (9.5, 11.0) | 10.5 (9.4, 11.0) | 6.0 (5.8, 6.3) | 8.9 (8.4, 9.4) |
| 6 | US | Antares | 502 | 347 | 357 | 12.7 (11.0, 13.1) | 12.6 (10.3, 12.9) | 6.0 (5.8, 6.5) | 8.9 (8.5, 9.5) |
| 7 | US | ρ Sco | 240 | 173 | 180 | 13.7 (13.1, 15.0) | 13.7 (13.0, 15.0) | 7.9 (7.4, 8.3) | 11.5 (10.4, 12.4) |
| 8 | US | Scorpio-Body | 373 | 262 | 268 | 14.7 (14.0, 15.5) | 14.0 (13.6, 15.5) | 9.1 (8.8, 9.5) | 13.2 (12.6, 13.8) |
| 9 | US | US-foreground | 276 | 204 | 210 | 19.1 (17.8, 21.5) | 18.4 (17.7, 19.4) | 12.5 (12.1, 13.1) | 17.4 (16.6, 18.2) |
| 10 | UCL | V1062-Sco | 1029 | 760 | 778 | 15.0 (13.6, 15.9) | 15.1 (13.1, 15.9) | 10.0 (9.8, 10.5) | 13.2 (12.4, 13.7) |
| 11 | UCL | μ Sco | 54 | 43 | 44 | 17.2 (14.8, 18.1) | 15.3 (14.8, 18.0) | 9.6 (9.0, 10.5) | 13.6 (12.4, 15.8) |
| 12 | UCL | Libra-South | 71 | 54 | 57 | 20.0 (17.8, 22.5) | 19.4 (17.8, 22.7) | 12.4 (10.8, 13.3) | 18.9 (17.3, 21.8) |
| 13 | UCL | Lupus 1-4 | 226 | 137 | 138 | 6.0 (5.1, 6.6) | 5.9 (4.8, 6.5) | 4.3 (4.1, 5.2) | 6.3 (5.7, 7.1) |
| 14 | UCL | η Lup | 769 | 580 | 598 | 15.3 (15.0, 15.9) | 14.8 (14.1, 15.5) | 9.8 (9.1, 10.1) | 14.4 (13.8, 14.7) |
| 15 | UCL | ϕ Lup | 1114 | 792 | 825 | 16.9 (16.3, 17.8) | 17.7 (16.4, 17.9) | 9.9 (9.4, 10.3) | 16.4 (15.9, 17.0) |
| 16 (b) | UCL | Norma-North | 42 | 32 | 33 | 42.1 (33.2, 51.1) | 35.3 (29.2, 51.2) | 38.8 (29.9, 42.9) | 36.0 (28.5, 42.5) |
| 17 | UCL | e Lup | 516 | 401 | 413 | 20.9 (20.1, 21.6) | 21.4 (20.8, 22.3) | 11.0 (10.7, 11.5) | 17.9 (16.4, 20.1) |
| 18 | UCL | UPK606 | 131 | 97 | 100 | 13.4 (12.7, 14.8) | 13.2 (12.7, 14.7) | 8.5 (8.0, 8.9) | 12.5 (11.7, 13.2) |
| 19 | UCL | ρ Lup | 246 | 182 | 190 | 14.4 (13.5, 14.8) | 14.4 (13.4, 14.8) | 9.4 (8.9, 10.2) | 13.8 (13.0, 14.1) |
| 20 | UCL | ν Cen | 1737 | 1265 | 1335 | 15.7 (14.8, 16.0) | 15.2 (14.9, 16.1) | 9.5 (8.8, 12.1) | 14.6 (14.3, 15.1) |
| 21 | LCC | σ Cen | 1805 | 1308 | 1342 | 15.5 (15.0, 16.1) | 15.5 (15.1, 15.9) | 9.5 (8.8, 9.9) | 14.7 (14.4, 15.3) |
| 22 | LCC | Acrux | 394 | 276 | 283 | 11.2 (10.2, 12.2) | 10.7 (10.1, 11.5) | 7.3 (6.9, 7.4) | 10.4 (10.1, 10.8) |
| 23 | LCC | Musca-foreground | 95 | 66 | 67 | 10.2 (9.5, 11.2) | 10.3 (9.5, 11.8) | 6.9 (6.7, 7.4) | 10.7 (9.8, 11.7) |
| 24 | LCC | ϵ Cham | 39 | 23 | 24 | 8.8 (8.4, 9.4) | 8.8 (8.4, 10.8) | 5.4 (5.0, 6.0) | 7.9 (7.1, 9.6) |
| 25 | LCC | η Cham | 30 | 20 | 21 | 9.4 (8.5, 10.8) | 8.8 (8.6, 10.8) | 6.1 (5.5, 6.9) | 8.6 (7.4, 10.5) |
| 26 | Pipe | B59 | 32 | 15 | 15 | 3.4 (2.5, 6.5) | 6.5 (3.2, 6.9) | 3.0 (2.1, 3.1) | 3.1 (2.6, 4.4) |
| 27 | Pipe | Pipe-North | 42 | 31 | 31 | 15.9 (13.8, 17.5) | 16.5 (13.1, 19.9) | 10.1 (8.4, 10.8) | 13.3 (12.1, 16.7) |
| 28 | Pipe | θ Oph | 98 | 70 | 70 | 15.4 (13.5, 16.2) | 14.1 (13.4, 15.9) | 9.5 (8.9, 10.5) | 15.6 (14.0, 16.3) |
| 29 | CrA | CrA-Main | 96 | 65 | 69 | 8.5 (6.1, 10.5) | 9.1 (8.1, 11.3) | 6.1 (5.5, 8.5) | 8.6 (7.4, 10.6) |
| 30 | CrA | CrA-North | 351 | 243 | 271 | 11.6 (10.8, 12.1) | 11.2 (10.8, 11.8) | 6.6 (5.8, 6.9) | 9.9 (9.2, 10.9) |
| 31 | CrA | Scorpio-Sting | 132 | 92 | 94 | 14.5 (13.9, 15.1) | 13.9 (12.6, 14.5) | 8.5 (8.1, 9.0) | 11.3 (10.6, 12.3) |
| 32 | Cham | Centaurus-Far | 99 | 66 | 68 | 8.5 (7.2, 9.6) | 8.0 (7.2, 9.6) | 5.9 (5.6, 7.1) | 9.0 (8.1, 11.1) |
| 33 | Cham | Chamaeleon-1 | 192 | 107 | 114 | 3.8 (2.9, 5.7) | 3.5 (2.7, 4.3) | 3.0 (2.6, 3.8) | 3.8 (3.3, 4.3) |
| 34 | Cham | Chamaeleon-2 | 54 | 24 | 24 | 2.8 (1.7, 3.5) | 2.1 (1.7, 2.9) | 2.8 (2.4, 3.1) | 3.1 (2.5, 4.1) |
| 35 | NE | L134/L183 | 24 | 11 | 11 | 9.6 (7.4, 11.3) | 9.7 (7.2, 13.6) | 5.7 (5.1, 6.6) | 9.4 (7.9, 11.7) |
| 36 (b) | NE | Oph-Southeast | 61 | 49 | 52 | 9.2 (7.5, 12.5) | 8.0 (7.2, 9.2) | 9.5 (8.5, 9.7) | 9.5 (9.0, 11.3) |
| 37 (b) | NE | Oph-NorthFar | 28 | 20 | 22 | 19.1 (14.5, 25.7) | 19.4 (14.9, 24.2) | 9.8 (8.5, 14.9) | 17.5 (14.1, 21.0) |
Notes. The ages are given for the four isochronal fitting results using the PARSEC and BHAC15 models for both the BPRP and GRP CMDs. The lower and upper age limits are given in parenthesis, determined from the 1σ highest density interval from the marginalized posterior PDF. The differently determined ages are compared in Fig. A.3. The clusters are grouped into traditional subregions for orientation, motivated by the original Blaauw borders, as described in Paper I, while these separations should generally not be treated as physically meaningful entities.
The numbers of sources are as follows: All = the number of all stellar member candidates per SigMA cluster. BPRP = after applying the photometric quality criteria for the BPRP CMD. GRP = after applying the photometric quality criteria for the GRP CMD.
The three clusters Norma-North, Oph-SE, and Oph-NF are excluded from the analysis of the star formation history in Sco-Cen since they are likely unrelated (see text), hence, they are not included in Fig. 1, which shows the cluster surfaces in 3D of the 34 remaining clusters.
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