Open Access
Table 3
Examples of well-studied HFSs that display the ‘two peaks’ or ‘double nodes’ of star formation.
| Target | Evolutionary stage | Nodes | Separation | Distance | ||
|---|---|---|---|---|---|---|
| Young | Old | Angle (″) | proj (pc) | pc | ||
| NGC 1333 | Early | SSV13/IRAS3 | BD+30°549 | 426″ | 0.5 | 238 |
| W3(OH) | Early | Taylor–Welch | IR cluster | 37″ | 0.36 | 2000 |
| G31.41 | Early | P2 | P1 | 41″ | 0.75 | 3750 |
| NGC 6334 | Intermediate | NGC6334I(N) | NGC6334I | 112″ | 0.7 | 1300 |
| Orion | Intermediate | BN/KL | Trapezium | 70″ | 0.14 | 412 |
| NGC 2264 | Intermediate | IRS2 (NGC2264D) | IRS1 (NGC2264C) | 410″ | 1.6 | 800 |
| Aquila rift | Intermediate | Serpens South | W40 | 20.6′ | 1.46 | 260 |
| W3 Main | Intermediate | IRS 5 | VLA-C | 70″ | 0.68 | 2000 |
| S 106 | Evolved | IRS 4 | IR cluster | 55'″ | 0.35 | 1300 |
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