Table 2.
Detected spectral features and target classification.
| Accretion features |
Disk features |
Outflow features |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Target | Other names (1) | Hα, β(2) | Pa | Ca II | Brγ | Fe II | CO (3) | [O I] | [Fe II] | H2 | Classification |
| series | IRT | 1687.8 | 630.0 | 1643.5 | 2121.8 | ||||||
| S1 | – | – | A (w) | – | – | – | – | E ( * ) | – | – | – |
| S1-SE | – | – | – | – | – | – | – | – | – | E (w) | – |
| S2 | IRSW-11, NIC07a | E (rs) | – | E | E ( * ) | – | – | – | – | – | MYSO |
| S3 | – | E | E (w, *) | – | E (w, *) | E (w) | – | E ( * ) | – | E | MYSO |
| S3-K | – | – | A (w, *) | A | – | – | A | – | – | – | M-type giant |
| S4 | IRSW-30, NIC03a, P3 | E (rs) | E ( * ) | E | E | E (w) | E (w) | E | E (w) | E | MYSO |
| S5-A | IRSW-133, VFTS 476 | A | A | – | – | – | – | – | – | – | MS star |
| S5-B | – | – | A (w) | – | E (w) | – | – | – | – | – | MS star |
| S5-C | – | – | A (w) | – | – | – | – | – | – | – | MS star |
| S5-D | – | – | – | A | – | – | – | E ( * ) | – | – | Foreground star |
| S5-E | IRSW-127 | – | – | E (w) | – | – | E (w) | – | – | E | MYSO |
| S5-F | – | – | – | – | – | – | – | – | – | – | MS star |
| S6 | NIC16a, P2 | – | E ( * ) | – | – | – | – | – | – | – | – |
| S7-A | IRSN-122, NIC12b, P1 | E | E (w, *) | – | E | E | E (w) | E ( * ) | – | E | MYSO |
| S7-B | IRSN-126, NIC12d, P1 | E | E (w),(4) | – | E (rs) | E | – | – | E (w),(4) | E | MYSO |
| S8 | IRSN-137, NIC15b, P4 | E (rs) | E ( * ) | E (w) | E (w, *) | – | – | – | – | – | MYSO (5) |
| S9 | IRSN-152 | E | – | – | E ( * ) | E | – | – | – | E | MYSO |
| S10-A | – | – | E ( * ) | – | – | – | – | – | – | – | – |
| S10-BC | – | – | – | – | – | – | – | – | – | E (w) | – |
| S10-K | – | E (w) | – | E (w, *) | – | – | – | – | – | – | – |
| S10-SW-A | IRSN-169, S11 | E (rs) | E | – | E | E | – | – | – | E | MYSO |
| S10-SW-B | IRSN-170, S11 | E (w, rs) | – | E (w) | – | – | – | E (w) | – | E (w) | MYSO |
| R135 | VFTS 402 | E | E | – | E | – | – | – | – | – | WR star |
Notes. A indicates an absorption feature, (E) an emission feature, (w) a weak feature, (rs) a red shoulder in the emission, ( * ) a bad nebular residual, and – the absence of the feature. The classification of a candidate as MYSO was based on the presence of the listed spectral features. A question mark (?) indicates that the proposed classification is uncertain. Some sources could note be classified. The confirmed MYSOs are highlighted in bold face.
IRSx-xxx (Rubio et al. 1998), NICxxx (Brandner et al. 2001), Px (Hyland et al. 1992), and VFTSxxx (Evans et al. 2011).
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