Table 2.
O(B) stars in and around NGC 6618, with and without spectral classification, sorted by their Ks magnitude.
| Identifier | α | δ | Ks | Spectral type | Projected distance | Distance | Ruwe | Member | Ref. |
|---|---|---|---|---|---|---|---|---|---|
| from centre | |||||||||
| (–) | (deg) | (deg) | (mag) | (–) | (arcmin (pc)) | (pc) | (–) | (–) | (–) |
| Confirmed O stars on basis of spectroscopy, this work | |||||||||
| BD-164831 | 275.3346 | –15.9865 | 7.5 | O9.7 Ia | 16.8 (8.3) | 2437 |
0.970 | N | – |
| B260 | 275.1078 | –16.1423 | 7.8 | O9.5 V | 2.2 (1.1) | – | 8.380 | C | – |
| BD-164834 | 275.3659 | –15.9591 | 7.9 | O9.5 II | 19.2 (9.5) | – | 7.072 | C | – |
| LS4943 | 275.2547 | –16.0964 | 8.9 | O9.7 V | 9.1 (4.5) | 1594 |
0.869 | N | – |
| B181 | 275.1260 | –16.1764 | 9.0 | O9.7 III | 0.3 (0.1) | 1772 |
1.174 | Y | – |
| LS4941 | 275.2412 | –15.8968 | 9.5 | O9.7 V | 18.1 (9.0) | 1562 |
0.765 | N | – |
| Confirmed O stars on basis of spectroscopy, literature | |||||||||
| B189a | 275.1246 | –16.1790 | 5.7 | O4 V | 0.2 (0.1) | – | 1.240 | Y | 1 |
| B189b | 275.1242 | –16.1793 | 5.7 | O4 V | 0.2 (0.1) | – | 1.418 | C | 1 |
| BD-164826 | 275.2593 | –16.0169 | 7.3 | O5 V((f))z | 12.4 (6.1) | 1741 |
1.019 | N | 2 |
| +O9/B0 V | |||||||||
| B111 | 275.1437 | –16.1700 | 7.5 | O4.5 V | 1.4 (0.7) | 1817 |
1.109 | Y | 3 |
| B0 | 275.1143 | –16.2253 | 7.5 | O6.5 V((f))z | 3.0 (1.5) | 1597 |
1.016 | N | 4 |
| B98 | 275.1474 | –16.1802 | 7.6 | O9.5 V | 1.5 (0.8) | – | 19.488 | C | 4 |
| B164 | 275.1284 | –16.1688 | 8.8 | O6 Vz | 0.6 (0.3) | 1637 |
1.123 | Y | 3 |
| B311 | 275.0946 | –16.1428 | 8.9 | O8.5 Vz | 2.5 (1.3) | 1391 |
1.032 | N | 3 |
| B289 | 275.1016 | –16.1454 | 9.2 | O9.7 V | 2.2 (1.1) | 1694 |
1.177 | Y | 3 |
| Candidate O stars on basis of photometry, literature or this work | |||||||||
| SLS373 | 275.1495 | –16.2620 | 6.8 | O3-6: V | 5.4 (2.7) | 1735 |
0.884 | N | 5 |
| B174 | 275.1268 | –16.1814 | 7.6 | O3-6: V | 0.4 (0.2) | 1995 |
1.147 | Y | 1 |
| SLS17 | 275.0125 | –16.0352 | 7.8 | O6-9: V | 10.5 (5.2) | 1686 |
1.042 | N | 5 |
| 2MASS J18182392 | 274.5996 | –17.3644 | 7.9 | O7-B0: V | 77 (38) | 1755 |
0.867 | N | – |
| –1721517 | |||||||||
| B137 | 275.1378 | –16.1893 | 8.1 | O3-5: V | 1.2 (0.6) | 1803 |
1.063 | Y | 1, 5 |
| HCS6500 | 275.1111 | –16.1191 | 8.6 | O5-7: V | 3.5 (1.7) | 1648 |
1.195 | N | 1, 5 |
| B197 | 275.1241 | –16.1937 | 9.7 | O9-B1: V | 1.1 (0.5) | 1684 |
1.208 | Y | 1, 5 |
| Confirmed B stars on basis of spectroscopy, this work | |||||||||
| BD-164822 | 275.1987 | –16.0267 | 8.2 | B2.5 II | 10.0 (5.0) | 1593 |
0.999 | N | – |
| BD-154928 | 275.0575 | –15.6642 | 8.3 | B0.5 V | 30.9 (15.3) | 1676 |
1.114 | N | – |
| +B1.5 V | |||||||||
| LS4972 | 275.5131 | –15.7727 | 8.7 | B1 V | 33.1 (16.4) | 1591 |
0.750 | N | – |
| +B2 V | |||||||||
| BD-164832 | 275.3580 | –16.0217 | 8.9 | B0 V | 16.5 (8.2) | 1630 |
0.846 | N | – |
| +B1 V | |||||||||
Notes. Membership is indicated by “Y”; non-members by “N”, and candidate members by “C”.
References. (1) Hoffmeister et al. (2008); (2) Maíz Apellániz et al. (2019); (3) Ramírez-Tannus et al. (2017); (4) Maíz Apellániz et al. (2022a); (5) Povich et al. (2009).
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