Table 3.
Spectroscopically classified OB stars in W51.
| # | ID | Field | RA | Dec | J | H | K | Sp Type (b) |
|---|---|---|---|---|---|---|---|---|
| (h m s) | (° ′ ″) | (mag) | (mag) | (mag) | ||||
| 1 | OBS7slit08 | IV | 19 22 14.39 | +14 03 09.0 | 11.58 ± 0.01 | 10.63 ± 0.01 | 10.04 ± 0.01 | O3V–O5V |
| 2 | OBS6slit07 | III | 19 23 01.68 | +14 16 40.4 | 13.68 ± 0.06 | 11.60 ± 0.04 | 10.34 ± 0.04 | O3V–O5V |
| 3 (a) | OBS2slit17 | II | 19 23 42.85 | +14 30 27.7 | 17.79 ± 0.03 | 13.58 ± 0.02 | 11.10 ± 0.02 | O3V–O8V |
| 4 | OBS9slit17 | III | 19 23 07.76 | +14 15 48.6 | 13.96 ± 0.02 | 12.34 ± 0.01 | 11.29 ± 0.01 | O9V–B2V |
| 5 | OBS9slit08 | III | 19 23 02.65 | +14 16 32.9 | 14.95 ± 0.02 | 12.67 ± 0.01 | 11.31 ± 0.01 | O5V–O7V |
| 6 | OBS3slit16 | II | 19 23 41.03 | +14 29 26.9 | 17.99 ± 0.05 | 14.34 ± 0.01 | 12.18 ± 0.01 | O9V–B2V |
| 7 | OBS3slit17 | II | 19 23 44.79 | +14 29 11.0 | 17.89 ± 0.04 | 14.99 ± 0.02 | 13.24 ± 0.02 | B1V–B3V |
| 8 | OBS7slit24 | IV | 19 22 14.74 | +14 04 43.3 | 14.50 ± 0.01 | 13.84 ± 0.01 | 13.46 ± 0.01 | B8V–A3V |
| 9 | OBS8slit24 | IV | 19 22 18.02 | +14 05 10.3 | 15.13 ± 0.01 | 14.08 ± 0.02 | 13.46 ± 0.02 | B3V–B9V |
| 10 | OBS9slit23 | III | 19 22 59.25 | +14 17 22.9 | 14.57 ± 0.01 | 14.12 ± 0.02 | 13.74 ± 0.02 | B8V–A3V |
| 11 | OBS8slit23 | IV | 19 22 17.45 | +14 04 56.3 | 14.55 ± 0.01 | 14.02 ± 0.01 | 13.76 ± 0.02 | B3V–B7V |
| 12 (c) | OBS3slit15 | II | 19 23 42.99 | +14 30 17.3 | 18.79 ± 0.08 | 16.65 ± 0.02 | 13.78 ± 0.01 | B1V–B7V |
| 13 | OBS3slit09 | II | 19 23 37.36 | +14 31 17.0 | 16.73 ± 0.02 | 15.05 ± 0.02 | 13.85 ± 0.03 | B3V–B7V |
| 14 | OBS9slit15 | III | 19 23 04.51 | +14 15 33.5 | 18.22 ± 0.05 | 15.45 ± 0.01 | 13.89 ± 0.01 | B3V–B7V |
| 15 | OBS6slit16 | III | 19 23 07.49 | +14 16 05.9 | 16.97 ± 0.02 | 15.47 ± 0.02 | 14.52 ± 0.02 | B8V–A3V |
| 16 | OBS1slit17 | II | 19 23 38.50 | +14 32 02.4 | 16.92 ± 0.02 | 13.84 ± 0.01 | 11.73 ± 0.01 | YSO |
| LS1 (d) | – | I | 19 23 47.65 | +14 36 39.1 | 8.10 ± 0.02 | 7.02 ± 0.06 | 6.24 ± 0.02 | P Cygni SG |
| 50 (e) | – | II | 19 23 42.88 | +14 30 12.8 | 17.49 ± 0.03 | 14.09 ± 0.01 | 12.09 ± 0.01 | O6.5V |
| 57 (e) | – | II | 19 23 33.74 | +14 29 53.8 | 16.66 ± 0.03 | 12.85 ± 0.01 | 10.64 ± 0.01 | O4 V |
| 61 (e) | – | II | 19 23 47.21 | +14 29 43.6 | – | 15.16 ± 0.02 | 12.51 ± 0.02 | O7.5V |
| W51d (e) | – | II | 19 23 39.92 | +14 31 08.5 | 15.11 ± 0.02 | 12.32 ± 0.02 | 10.50 ± 0.03 | O3V–O4V |
| IRS2E (e),(f) | – | II | 19 23 40.12 | +14 31 05.9 | – | 16.70 ± 0.01 | 10.80 ± 0.01 | YSO |
Notes.
Source #44 in Figuerêdo et al. (2008).
Spectral types obtained by comparison with reference stars from Hanson et al. (1996, 2005) and Bik et al. (2005).
Not detected in the J-band in our catalogue, hence we used the value from the UKIDDS Galactic Plane Survey DR6 (Lucas et al. 2008).
Identified by Okumura et al. (2000) and spectrally modelled by Clark et al. (2009). Photometry taken from 2MASS.
Sources spectrally classified by Figuerêdo et al. (2008) and Barbosa et al. (2008). Photometry taken from our own data.
Photometry taken from Figuerêdo et al. (2008).
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